jumping + backstabbing takes so much away from the tactical combat, that is 5e.
Flanking is an optional rule in 5e, but it would be a lot better to use this rule, instead of this backstabbing homebrew.
maybe even make flanking optional in the settings.
but as it is, there is virtually no battlefield control.

i can understand, if they don't implement grappling mechanics, because it would be complicated.
but the way they changed the rules from 5e makes battlefield control basically non-existent.