In all seriousness though, the issue isnt just that .50cal damage is too low, but that other nations with near identical guns somehow deal more damage.
In theory, WarThunder did set up the hit point according to this, you can dig into the blkx file to see the specific health value been assigned to each parts of each plane. However, in real game it’s not necessarily correlate with those values. Planes like Bf109 and Yaks are given relatively low hp value on its structural parts, but they can absorb a lot damages. In contrast, plane like F6F, F4U are given high hp values, but still very fragile against HE round.
Excluding the fact that some planes (Yak series, Ki-84) are given low value of been sit afire on their fuel tanks helped their survivability, the size, thickness, spatial topology and material matters more in real game environment for a plane to absorb hits, especially against fragmentation rounds under the real-shitter mechanism. The FlightModel also contributes to the survivability, planes with high cirtical aoa and good stall characteristic (Bf109s, Yaks) tend to absorb punishments and keep flying and manoeuvring. Those with low critical aoa, bad stall and not much tapered wing area ( FW190, F6F, F8F) will get into a unrecoverable spin by itself whenever a relatively hard wing damage happens, despite with high HP points.