GamePress
Anyone noticed this?
I noticed that with the latest update, you actually promote 3-4 star unit potential right out of the gate, assuming you still have the feather amount.
For example, I was able to promote a 4 star Cherche to 5 star at level 1 right away.
This is a nice convenience if you want to quickly add merges and/or inherit 5 star skills and weapons to 4 star merged units.
However, if you are going to use the promoted unit in the future, I think it is still a good idea to get most of the 4 star available skills and build up SP before promoting so that way you can save some SP when using skill inheritance and even weapon refinery.
Hopefully this is very helpful!

Fate Grand Order
Dragonball Legends
IV Calc
Heroes