I think a vehicle overhaul could fix many of the problems in the game right now.
I propose 4 new infantry vehicles:
1. Anti Tank
Similar to the tank but the shells fly straight and fast with minimal splash damage
High armor for resistance to tanks and helis but little resistance to infantry
2. Supply Medic Truck (no armor/ unarmed)
Close proximity slowly heals and refills ammo (within 5-10m)
Near proximity boosts medics and support (within 50m)
-Boost for medics: revives are full health + some shield (5-10) and ammo
-Boost for support: max shield can go up to 25-35 and max ammo increases 20%
3. Heavy Trucks/ Riot Vans (minimal weapons/high armor)
Difficult to destroy and remains do not despawn after destruction, essentially a mobile wall that can provide good cover and spawn points for infantry
This can also provide a great ambiance of destroyed vehicles littering the landscape where battles actually occurred for the end scene
4. Mobile Spawn Team Spawn Point (unarmed/no armor)
1-2 seats
As long as there are no enemies within 30m players will be able to spawn in that radius
This update can address the problems that are currently being faced.
-Base spawn will have different vehicle options and mobile spawns to drastically cut any initial running
-All Cap scenarios become more difficult because of the bonuses that staying close as a team provides and one vehicle per team acting as a spawn point on the map can quickly change the game if the dominant team is unable to contain them or has to spread their vehicles across points to defend
-Vehicles will have to be concerned about the new anti tank vehicle specifically targeting them limiting their ability to target infantry
-these changes would mostly apply to fixing 128 player modes I see amazing potential in 128 players, 64 is currently better paced
-Line of sight blockers are moved at the players discretion fitting need
-Cover is moved at the players discretion fitting need
-Paths and Objectives become relatively closer when spawn points are more convenient and abundant
-It will be much easier to join in pushing with the team when you can spawn on the team rather than hoping your squad is not in combat and alive
Map changes that could accompany this would be more narrow alleys to block movement of vehicles, more buildings/ bill boards / anything that can stick up in the air and block heli harrassment, more underground Metro push type areas connecting points or maybe a smaller Pearl Market like shanty town areas around objectives to engage infantry without worrying about helis
I hope something helps!