Both could be fixed by mods/patches - even official ones. You don’t need a remake.
Old games, just like old movies, are only relevant and great as products of their time. Gothic is dated as hell in many regards - which is perfectly ok - so a remake would either be just a glorified texture pack or wouldn’t be true to the original.
Make it playable, add new textures, higher resolution, etc. where possible, but don’t change the actual game.