I agree with you that people are noticing that Twitter going back to the size it was in 2015 has not really impacted the product, but it has definitely impacted the business. Musk's handling of twitter has been awesome for correcting his public image.
I think everyone who is honest accepts that Twitter was massively bloated. By the time Musk made his offer, it was 8x the size it was in 2011 and the product really hadn't changed much in a way that required that kind of increase. But Twitter is an awful experiment because of Musk's clownish handling of just about everything.