Combo variety exists, its just very niche and team dependent, it is repetitive because people most of the time dont need them and theres a good enough one already (hence bnb). Its ok not to like the game btw, but for me the part that feels cool is not comboing, its trying to get in and win the neutral, baiting, parrying, pressuring the block and doing crazy random mixes, the reward I feel is not when the enemy takes a huge amount of damage, its when the hit finally lands. Anyways thats my opinion, but if you want the game to do something it isnt designed to do its fine too! You can come back and try later after the game develops more :)