The main advantage to the ACRO is that it is a closed housing allowing crud to be wiped off, while on the RMR the crud will get stuck on the emitter “nook”. Well couldn’t Trijicon just design the RMR with a flush emitter that can be wiped easily...perhaps put a flush glass cover over it? You don’t need water any more, now you can wipe the rmr with your fingers just like the ACRO while keeping the smaller footprint of the RMR. Simple fix. Call it RMR type 3