It is possible you may loose some fps but then there is the theory of barrel harmonics. Not all barrels react the same way and in some cases a 24" will produce better accuracy.

My 54cal DISC carbine will out shoot my 50cal DISC with the same bullet and amount of BH209 (max). So it not all about length. Knights original DISC had 24" barrels and shot as well or better than the longer barrels.

I will take better accuracy over a 50-100fps gain any day.

Handling and balance are another issue. On a bench it isnt as pronounced but carrying a lighter and better balanced gun all day is a big plus to me. The shorter barrel on the new Omega Dream season vs a standard Omega was quite noticeable in this regard.

Form should follow function/application so there is no perfect answer for everyone's preference or needs.