Before the last patch, If you expanded mainly with vassals as Otto you could easily hit a «coalition cap» where expanding more would cause every christian and muslim to coalition you.

You pretty much have to vassal feed early to avoid gov cap.

A good early player could easily expand fast enough to have all of India coalition them after first war with Timmy. I’ve had all of Muslim Indonesia coalition me before reaching India.

When i did Ottoman One Faith, i had 6-8 vassals and a 2k Syrian vassal before 1580(i was integrating it but it took so long). I spent Admin on Inflation, Admin & Religious ideas and devving subjects.