Alryt Bro there is a bit of technical reasoning involved on this part of discussion.
You know 4GR-FE and 4GR-FSE are no biggies but the direct injection system makes a difference?
First of all the 1UR-FE has no direct injection system deployed over it which makes it produce less power.
Imagine when each cylinder gets its own share of gasoline by extra multi-pointed nosels, the more lean and rich it is, the more gasoline and efficient burning of mixture the more power it produces as simple as that.
When you accelerate more, ECO detecs DBW tech and pours in more gasoline again more air and more power. It has several benefits on the higher RPMS.