It's easy to be an armchair general but on the topic of of bridges , one huge tragedy is that Ukraine failed to blow the Antonovski bridge at Kherson on the first day. Largely I fear because of the treasonous actions of the local administration .
I read a great article
https://www.dailykos.com/stories/202...ike-a-good-bet ). If that had happened then Kherson would not have been occupied, there would not have been huge fighting at Mykoliev ( where RuAF needed to get across the Bug to attack Odesa). In that case at least 2 brigades could have reinforced Nova Kakhova ( head of the crimea canal) and perhaps that would not have fallen , giving another direction for UAF to reinforce towards Mariupol or Melitopol, or to threaten the ingress from Crimea. Sure that would have freed up Rus units too , but they would have been operating on longer supply lines.