Room treatments/problems are overrated! Let me share an interesting AGon story:
I posted on the forum for some help powering my KEF Reference 1 Metas regarding no bass output. I was utilizing the legendary Luxman 590AXII 30W Class A. The overwhelming response was that my room was the problem. The Luxman should have no problem powering the baby KEFs. I greatly appreciated the forum's help and support, but I knew that the advice didn't seem right. I brought the amp to a local dealer and A/B against higher power amps. Magically, the bass appeared!
Short story long, I ended up going off the rails and purchased a pair of McIntosh MC611s. & C2700. My bass output in the same room is easily 300% better.
Lastly, you mentioned the "sound engineers" on the forum. I guarantee you that if you took measurements of their rooms before and after treatment, the rooms probably had better measurement results pre-treatment. It only sounds better because they justify the cost of some obscure piece of pillow foam changing the dynamics!😁 The best and most significant improvement would be to add a nice carpet and drapes if necessary.