When creating any video game that contains a number of RPG elements determining power as levels increase can be challanging. As numbers increase it technically becomes easier to adjust them but when you add more factors that augment power you can end up with some wildly bloated numbers very quickly. This has been the case since BL2.
The more passive skills, anointments, and class mods that impact damage the higher those numbers can go. This is why BL3s balance is all over the place. We have some damage increases that stack others dimishis due to multiplicative applications.
Vehical health or armor is based off the players health and shields if I remember correctly similar to IB. So the values are fairly flat.
As many of us noticed at launch it was around level 45 that vehical balance fell apart. Vehicals struggled to kill enemies. Guns could easily destroy vehicals and this only got worse with each level and the more so with Mayhem levels. They made adjustments to vehical health via hotfixes which made things better but far from ideal. When level increases started to drop the same problem re emerged. GBX just kind of left it until Bounty of Blood and they adjusted HP and added additional Mayhem scaling. Same story not ideal balance then level cap increases.
Each time they increases the levels HP and shields go up and so dose damage but damage climbs at a higher rate because it is balanced against enemy health pools not vehicle health pools. Armor is alot thicker when your low level without super sorces damage and 2-3 different elements firing off at once.
In my mind the best solution is to reduce all damage guns do to vehicals buy an astronomical amount. Give vehicals damage and armor the same treatment as iron bear with a ton of skill points invested in skills like Stainless Steel Bear and Specialist Bear.
Obviously there is a ton of number work to be done but as of right now if the same “fix” we have seen twice it will be underwhelming for the time being then it will be undone when we eventually get the next level cap increases.
I think the team is aware some drastic changes need to be made but I have the suspicion it is not a priority right now given they just launched new content.