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.
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.
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).
