They are overcompensating. They found flaws in the "Stack of Doom" and decided to reduce it to only 1 unit per tile.
I don't like the 20+ units per tile either, but, 1 is too low.
I already had problems building enough units in Civ4.
Once walls, castles and fortified, city defense 3 Longbowmen on a hill were in place, cities became, very difficult to conquer.
I would think 2 units pet hex would be a good number. One could have a spearmen, and a swordsmen, but, be vulnrable to an axeman, for example.
I am worried about the lameness to come.
The English blockaded the entire US east coast at one time.
Will the English 1000 Naval vessel Fleet be reduced to just 4 boats, because, of cost restrictions?
If they change too much, they could create a dismal MOO3 failure, or almost as bad, spend alot to make a so-so game, that doesn't get picked up for a Civ6.