In my last game I found out that you can actually only upgrade one tile per round no matter how much overlay manufacturing you have i.e it costs 100 but you have 500 or more.

Is this working as intended? Doesn't make a lot of sense in my opinion. When I actually have a manufacturing planet I want to benefit from it and not wait 20 turns for an upgrade round instead of like 2-3.

I think I saw similar behaviour in research: Late game when you have more than 10000 points it still takes one turn for a lesser one to finish. They let you even see your points in the bottom left corner but don't show the cost in points only in turns. What is the point here?