I agree, @BillyYank, combat mounted feats FTW. Or even for travelling.
I kinda liked the POE1 hirelings you can hire to guard the stronghold, or the possibility to find different crew members (hiring them, rescuing them, helping them) to your ship in POE2. Even the different advisors in Pathfinder game, depending on your RP choices. They add flavor to the game and the possibility of converse with more and different characters.
It would be nice if they added some feature like that.
If the OP meant the silent mercenaries that you can create from scratch and use it in your party instead of your companions, I am sure that they will include that in the game. I do not really use that feature, but it is in so high demand in CRPG games (like having a brothel for whatever reason) that it is a no-brainer to include that.