Why is everyone so obsessed with perfect RT? The benefits aren't very great and the opportunity costs are enormous. Having amazing rulers all game and the events that fire from low RT are mostly positive? Yes, please.
No joke. A short-term re-election spamming nation with religious ideas is a formidable thing indeed.
The most significant cost is the lack of RMs unless you're Dutch or noble...and even then you're very unlikely to get PUs (I've had 90 prestige with Tibet and RM with Ayuthaya, and "on monarch death" it would go to 9 prestige Dai Viet) so it winds up being mostly a diplo tool. Noble republics actually struggle to keep RT down, though