The Repair Tool is the root of most ground-vehicle issues right now
Tanks are squishier than ever before in this game, they're paper mache if you know how to hit them. This might be an issue. However, the repair tool is BROKEN overpowered, legitimately appalling how strong it is, so if there are a couple engineers on a tank, it is borderline indestructible.
Paper mache tanks are really punishing, and broken repair tool leads to wildly inconsistent and unpredictable engagements that also lead to a lot of frustration for players who feel there is nothing they can do to damage one. I've had 2 minute long tank battles because neither of us can kill each other with all the repairs and we just give up and start farming each others' infantry. That sucks and is boring and lame. This has happened multiple times, on Manhattan Bridge, Siege of Cairo, etc. So many tank battles feel like they come down to "which one has more engineers repairing" rather than which can use cover, get the jump, get better angles, etc.
I think designing the tanks in this way is rife with issues. Because they are so squishy on their own, inexperienced tankers legitimately have no chance to do anything unless the are swarmed with repairs, and as mentioned above, it can lead to frustration taking them out when they are backed up sufficiently.
It also makes tank engagements BORING. The repair tool should not swing tank engagements this heavily. Tank battles are cool when they end in a big explosion, ideally lasting long enough for both drivers to make some decisions to affect the outcome. I've had way too many long, drawn out engagements that are just straight up not interesting because the repair tool outheals tank shells (especially with multiple engineers.)
Flanking the infantry isn't always available, and C4 has been nerfed tremendously in this game with 3 not even being guaranteed to take out a tank (another huge, huge issue.) The current vehicle balance feels very disappointing in this game, engagements are less interesting, and drivers have less agency than ever. Mirak Valley might be my favorite map were it not for the rough state of vehicles (ground and air, looking at you obscenely broken laser designator) and I'm hoping it will be once these elements are worked out.
Thanks :)