Slow down kiddo, and consider that the actual D&D rules are so restrictive that they don't translate well into a computer game if done completely literally.
Way to be condescending.
Like others already said: just look at Solasta. The rules work quite well in a video game. Some things obviously need a solution (mostly flavor-spells like Prestidigitation and Illusion spells)
And just like any home/tabletop DM will have "house rules" so also does Larian Studios. Having house rules is not a cheat if they apply to everyone.
Lots of tables have no or minimal house rules. To be completely honest: most house rules are bad from a game design standpoint. They are absolutely okay for a specific table to have more fun, but often fail hard for wider audiences.
High ground does give advantage in real life combat; and there are plenty of reports of people exerting themselves amazingly for short periods (historical berserkers come to mind).
Real life does not translate well into a computer game if done completely literally.
