The attacker 1st point is a pain. You are forced to pick Monke or Dive to get access to Defender highground , which they have too much advantage if your tank decide to play slow old Reinhardt or Mauga.
Delete this map or rework it. Its not fun when you are forcing specifically dive
Seemingly a controversial take but maps shouldn’t be designed around making already strong heroes even stronger. All it does is force mandatory comps.
That said I refuse to believe they didn’t consider balance implications at all when designing it and more than enough time has passed for them to have addressed the issues.
Numbani was pretty clearly designed at a time when the devs had no idea how Overwatch would be played. You can tell by the vast amounts of basically-unused map near attacker spawn.