They took our suggestions on separate leader caps : r/Stellaris
Leader cap increased to 100 - Skymods
Soft" leader cap ... : r/Stellaris
leader limit cap bugging out? : r/Stellaris
What I don't understand about this Stellaris update is that it's all about leaders but the game starts with a tiny six leader cap, which includes everything (scientists, governors, admirals, and generals), that cap runs out fast, and the leaders absolutely eat up ...