panup
On my behalf I was not cynical but in my opinion there are better alternatives for hobby mixers to control low end than just adding a subwoofer. It will not give you immediately better results because you'll have to learn mixing with subwoofer first. Subwoofer is almost useless until you have a good, well treated room with enough space; you can hear if there is "a lot of" or "not so much" low end but you're not able to hear anything accurately.
Of course it's not possible to make a comprehensive presentation of low end mixing in one post. That's why discussion continued here; to give alternative opinions and points of view.
It's not just a blog post. It's Cakewalk's blog post! It gets more attention than some anonymous blogs from unknown sources. Cakewalk means recording knowledge and professionalism.
The next blog post subject could be room treatment and setting up monitoring system. It has far more influence on the mixes than any plugin you use. New brickwall limiter or $$L compressor may improve your sound in the last 0.1 dB but a few acoustic panels in the right spots may improve mixes 9 dB.
I wasn't specifically referring to you Panu (or at all). It was just a general statement.
Anyway, I'd argue that sub or not, room treatment is important. Subs don't exacerbate this - they just make it more apparent at those frequencies. High frequencies are heavily affected by room problems as well, but one wouldn't not have speakers because if it. Anyway, room treatment wasn't the subject of Mike's post, it was about reproducing low frequencies from your monitoring system. While the two are related, they are arguably separate subjects and, IMHO, can be treated as such.
As it turns out, I believe one of our contributors is actually working on a room treatment related entry, if not a series, as we speak. It talks about DIY panels, bass traps, and even has a video companion. But we need time to get these things out.

These things come out in no particular order. It's kind of stream of consciousness from the bakery.