The entire point can be surmised in a single statement:
The point of a game is to have fun. The current design and flow of combat with all its complexities and computational attitude is decidedly NOT fun to play.
I hear you, but I really don't believe we need to deviate from the 5e ruleset at all. Just adding a difficulty setting in which the rollls slightly favoured the player would be enough to make it more accessible to more casual and new players.
