Your characters are not frogs in many tactical TB video games, so I guess it's not really related to the medium
Who said you can't use anything else than a bow if you're a ranger ? Just choose another class if the ranger doesn't suit... Or play a game like DoS in which classes doesn't really exist.
Jumping/disengage (because that's the beginning) in melee PROVIDE greater advantages, unbalance the game even more, combats looks visually silly, melee characters are useless, the rogue has way less specificity (even if he's still powerfull), many D&D spells, D&D skills and items become useless (i.e things that grants invisibility or and advantage), greatly reduce the tactical value of the game, Etc....
