i am the poster child for too much bass trapping. and it only took me 10 years to figure it out.
i did a clean sheet of paper built room in 2004 in a barn. it was a room inside a room. with bass trapping along the front walls (15’ x 9’ x 1’) and the rear wall in 4 places (2’ x 9’ x 1’), and the whole drop ceiling was a bass trap (21’ x 29’ x 18"). my designer said he would add all the bass trapping i might ever need, and i could remove it as i needed to.
what i did not know is how much i would need to learn to understand what i needed to do. i removed the front side wall trapping in 2010-2011 and some of the ceiling trapping. then in 2015 i removed the rest of the ceiling trapping. only the rear wall trapping now remains.
i had to evolve myself to be able to get it right.
the good news is i have been happy for the last 5 years, and fully satisfied now. the room breathes and has the most awesome bass you would ever hear.
but.......you can have too much bass trapping. but don't forget that 'you' and your understanding of what you are hearing is an essential part of getting it right.