"Omg, I can’t believe how people are rationalizing the use of subwoofers when their main speakers are not adequate to do a good job with bass."
I'm not sure why you have this opinion about poor bass and big woofers.
The size of the woofer and the quality of its bass reproduction have little or nothing to do with each other. It really depends on what you want from a woofer. Large, poor quality woofers can produce flabby, boomy bass down to 20hz, while smaller woofers might produce tight, accurate bass down to only 35hz.
As to the idea of adding subwoofers. Adding subs isn't meant to correct your perceived deficiencies in the main speakers. They are meant to correct deficiencies in the listening room. I always laugh when I see people buying a pair of subs and proceeding to place them right beside their main speakers. This placement merely accentuates the low frequency issues you bought them to correct. Subs should be placed where they produce the most accurate and even bass response within the room. That may be in opposing corners, midway along opposite walls or even half way up a wall.
You place your main speakers where they provide the best stereo imaging, the best soundstage and the best high frequencies. You add subs to improve the overall low frequency response. This is why even people with enormous tower speakers add subs to systems.
My main speakers are ATC SCM19 bookshelves. I added four subs.
I didn't do this so I could get home theatre bass. I did it so I could get accurate, lifelike bass.