That's about the size of it. There's loads of examples of amp, software and fx processors all doing great things and they can all virtually sound the same when manipulated.
If your dream rig is a $9 app or a $3000 fx unit then it doesn't really matter.
It's best to hoover up the software via sales and KVR and the apps are as cheap as chips.
Rather than manipulate software, I quite like their subtle differences. Playing guitar is fun and that's the bottom line. I'm lucky, as I have no idea what all the great amps sound like anyway because I've never owned them.