I already made a thread about Unique Units ideas for all civilisations in the AoE1 forums.
According to the poll I made most people want Unique Units for AoE1. [poll] What AoE2DE features would you like to see in Return of Rome?
The only thing the majority of people don’t want is AoE2 like drop off buildings and Castles.
A few polls are very decisive like gates or land trade, while others are more contested like starting Scout or Herdable Animals.
But not sure how many AoE2 fans just voted in favour of AoE2 things. I made the poll in the AoE1 forums though.