It gets 57mm proxy fuse ammo which no 10.0 SPAA gets. Closest you get is 40mm on the M247 at 9.3.
It does favor the situation. BR changes aren’t set in stone, the situation can be improved NOW for literally everyone else, and when BR decompression comes along it’ll have no problems coming back down due to the traditionally below average premium players.
Irrelevant, in that case its survivability should put it at a higher BR, not a measly 0.7 above the Begleit which is worse in every way including survivability.
Which by the way is lacking darts and IRST.
In-game they can do both roles and the 2S38’s main role IRL is as an SPAA.
Gepard also isn’t “intended” to engage ground targets, however it still carried a small supply of APDS for that very purpose. The same happens with the SIDAM 25.
On that very site you quoted they also provide range against ground targets, up to 2km.
Range against aircraft is 4 km and over 2 km against light armored vehicles and other ground targets. This artillery system could also be used in coastal defense role.
So the OTOMATIC was also intended to be able to engage ground targets if needed.
Another example if this double standard is the Gepard 1A2 - one of the biggest changes was the introduction of FAPDS-T , frangible ammo. The penetrator core was surrounded in a layer of plastic, which would fragment heavily when hitting aircraft while retaining all the AT capability of the earlier backup APDS. The introduction of this ammo implies that attacking ground targets became more relevant for the Gepard.
This ammo is not present in game, despite numerous bug reports/suggestions made.

post-pen effect illustration
Clearly a very different turret and mount. The feed system is also different, on warships it has an 80rd ready rack while on the OTOMATIC it is just 29.
Not to mention the addition of search and tracking radars, optronic tracking, and being redesigned from completely remote controlled to having 3 crew in the turret directly. This likely necessitated an entirely new fire control system as well.