What can't be found elsewhere, is the quality of their algos , i use the timstrech over any over ....

Yes I think that might be it. A wave editor was designed from the ground up to do more or less one thing and do it properly. 
As I always say, Sonar is my multi track and Wave Lab my 2 track. 

Also a Sound Forge (since time began) user here, with the same concerns as most here. Tried the demo of wavelab which was superb but a massive price to do pretty much what I already have in SF11. Decided to stick with what I have and watch this space.

I am a little confused by the OP. Is there a reason why an older version of SF is not adequate? I do not use SF but use Audition from 2011 and couldn't care less personally if it has been updated. Adobe went down the path of "pay for life" and all the features I want existed before then. Is SF any different?

When I bought Sound Forge 9 back in 2006 or so, I paid a pretty penny for it.
and sometimes as an artist, or even just as a person, we want to get our moneys worth out of something we pay for.
So myself personally, I held on to Soundforge because It was a tool I paid for.
 
Similar to the Tascam 388 (Studio 8) 8 track reel that I paid a grand for in the early 2000's.
The studio in Boston I was working at just started going digital and laughed at me for buying this 90lbs rock.
It's still in my studio today  as I refuse to let go of it. I use it for mixdowns (I run a hybrid studio).
Go ahead and laugh but if you remember how each channel on a board had distinct characteristics that varied in sound, harmonic distortion and darkness, then you know exactly why I run a hybrid. because its real and in the digital domain, we need a little bit of realism.
 
Or what about those plug in packs that cost a small fortune that are inferior now to todays standards.
As humans, its hard for us to let go of highly purchased items we paid an arm and a leg for.
But that's how I feel about Soundforge. I just don't use it enough anymore. but it does have its uses for producers.
the plug ins, at the time were state of the art stuff. Izotope I believe. That Wave hammer really got its uses .
And its Digital time stretching ability's were amazing for that point in time. I had never heard anything like it.
 

There are things a wave editor can do a DAW can't (see above) but mainly it is usually easier (and quicker) to do wave editing in, well, a wave editor. 
 
You are also switching hats with programs.  I open a mix up in SF and I'm not thinking about adjusting the reverb depth on the vocal or pushing the vol on the lead for a bit more - those tasks are finished.  Now I'm editing the sound of the whole file, topping and tailing and mastering.  Yes, I do take notes (more reverb here, more lead here) that I can go back to for the mix if I want to, but I also realize there are going to be new changes to a mix just about every time I listen to one.  But now is the time to make the unperfect a better song, not better mix.  Esp. working on a deadline, that is helpful.
 
@

AT
There are things a wave editor can do a DAW can't (see above) but mainly it is usually easier (and quicker) to do wave editing in, well, a wave editor. 
 
You are also switching hats with programs.  I open a mix up in SF and I'm not thinking about adjusting the reverb depth on the vocal or pushing the vol on the lead for a bit more - those tasks are finished.  Now I'm editing the sound of the whole file, topping and tailing and mastering.  Yes, I do take notes (more reverb here, more lead here) that I can go back to for the mix if I want to, but I also realize there are going to be new changes to a mix just about every time I listen to one.  But now is the time to make the unperfect a better song, not better mix.  Esp. working on a deadline, that is helpful.
 
@

 
++1... exactly
 
And Benny- As I said earlier, I bought Wave Lab Elements 7 for only $99 Can. I think that's a bargain considering how much I use it. And It will be probably good to use until Microsoft screws us up again. So I bet I get 10 years out of it.. That's $10 per year.

OK
 
Thanks for the comments.
 
I did some soul searching and I concluded that really I don't master very often, which is probably why I am not up on these details of audio engineering.
 
But thanks again for the info and thoughts.

By the by, I was buying something else on PluginBoutique the other day, and I discovered that Acoustica makes a wave editor. They have 3 versions: Free, Mid, and Premium. If you don't need surround, or their restoration algorithms, the standard edition looks like a good alternative at a good price: http://www.pluginboutique.com/product/3-Studio-Tools/48-Audio-Editor/1955-Acoustica-Standard-Edition
 
I have not used it myself, but I might go that route rather than updating my SoundForge 9, for a $100+ or whatever it is now.