Why Not Use 175 BTHPs?

[Scalce]

I have been playing with varying bullet weights in my 10.5" 300/221 AR and I have been having decent luck using 175s in SS loads.

How come more people are not using 175s?

Is it because they don't want the loss of energy or because they are difficult to get to shoot well at SS velocities and still cycle an AR?

I haven't noticed a serious increase in accuracy between 220/240 grain SMKs and 175 grain BTHPs of varying manufacturers.