I don't think Battlefield 4 (or I should say 5) needs to dial back stuff like player count and vehicle interactivity like Battlefront to work. 64 player Conquest is to me a defining point of Battlefield. But Battlefront highlights how abhorrent Battlefield 4's abundance of unlocks and attachment gimmicks are, especially the grind to access them, and the huge imbalances on vehicles when you're starting from scratch.
As much as I enjoy the games, it's where DICE lost the plot a bit with Battlefield 3 and 4. It's a sandbox battlefield of toys and tools but so many of them are hidden behind fucking stupid XP grind walls, and there is in reality probably far too many tools and toys and loadouts than necessary for a fun, balanced, and still diverse game. Half the shit just doesn't need to exist at all.
Battlefront seems a lot more focus in that respect, and it works in its favour.