I know that's going to piss some people off, but I think it's a GREAT decision to move the BR from a precision weapon to a unscoped sprayer. The DMR is already the precision weapon, and having both in halo 4 always felt dumb to me. if we're moving away from loadouts and toward real halo again, differentiating these weapons seems like a really good idea to me. I mean, a better idea might be to remove one, but 343 has shown that they like large sandboxes and I think that's ok. competitive types can always play with a reduced weapon set if they so choose.
remember, just because it has a reflex sight, that doesn't mean halo 5 will have ADS. the smg in ODST had one as well.