Now that it has been confirmed that the new pistol is currently replacing the M6 and is closer to something like the H5 Gunfighter or H2 Magnum, BR starts are now a necessity.
Halo multiplayer requires a strong versatile precision weapon off spawn to keep matches fair and prevent games from turning into one sided blowouts. Whether the precision weapon takes the form of a rifle or pistol, I’ve never much cared, but now that we know the Sidekick isn’t going to be up to par BR starts are now the go to choice.
You can make a bullet hose like the AR and a close range precision weapon like the Sidekick as good as you want, but they just are not up to the task to protecting new spawns. You are likely going to have no ability to respond to to any ranged weapon and you will be at the complete mercy of any close range power weapons. When you spawn with a BR(or CE Pistol or H5 magnum) you have the ability to turn the tide if you have the requisite skill. With a BR you can can keep a sniper at bay with descope while closing the distance and gaining advantage over said sniper. With a BR you can keep you distance from rockets and shotguns. With a BR(or another similar weapon) you have the ability to respond to just about every situation the moment you spawn which means you are always a threat to the enemy team. The same cannot be said for Auto starts.
As it stands AR/Pistol gametypes in Infinite would just be a repeat of the auto starts from Halo 2, 3, and Reach. Everyone wlll rush to the nearest scoped weapon and anyone without a BR or something similar is going virtually defenseless against someone who has a precision weapon and/or a power weapon. A close range weapon is only a threat at close range, meaning any decently experienced player can easily avoid a respawning player with auto starts and can easily predict where they will go because of their limited effective range.
This isn’t a Casual vs Competitive issue. Strong versatile precision weapons are important in both casual and hardcore playlists. No one should be forced into playing a competitive playlist just to get decent settings that don’t leave fresh spawns as sitting ducks. If you are concerned about players using a variety of weapons that isn’t a problem with BR starts provided the sandbox is actually diverse and interesting. Auto starts have never fixed the “variety” issue, they just add a pointless middle man to the proceedings where everyone rushes to the nearest scoped weapon they should have spawned with in the first place. “Variety” is an issue that concerns the entire sandbox, not the starting weapon.
TL;DR
BR starts are necessary now that the Sidekick has been confirmed to be a “sidearm” and isn’t suitable to being the main starting weapon in standard multiplayer gametypes.