I see your point and I partially agree with the 3 minute cooldown applying mid-fight being a bad mechanic, but in regards to the 12 brews, risk protection and youtuber content here are my counter-arguments:
1. I fully agree that surviving is not so hard with 12 brews, yet the issue remains that often times it's the pvmer who is on scroll timers and the pker isn't, so while the pvmer might not outright die to the pker, having them allowed to repeatedly attack the pvmer is anti-fun and the time waste disproportionately affects the pvmer compared to the pker.
2. In regards to the risk defence (I don't really get what would change by removing it) let's say raggers could only attack while you're out of combat with npcs, this might help with nex, callisto etc, but the rev killers would still be getting screwed over cause they kill the rev in like 3 seconds and then they'll just get ragged right after.
3. Content. I don't know who's watching content of killing pvmers at royal, I don't think it should be free farm at all and I think two attempts at killing them is enough. Anyway the majority of the content around roatpkz barely has anything to do with royal zone it's mostly gambling, riskzone, treasure hunts, tourneys, unboxings and pk vids where the player fights other pkers. Yes someone could make content around rushing at royal, but on the contrary you could argue that someone also might want to make pvm based content at royal and they'd be hindered by the way things are set up now.
My final point is that I'm not hoping for royal zone to be some pacifist, violence-free zone. I literally think more pvmers would come to royal as a result of the changes I suggested and then there'd be more for the picking for any pkers. If we screw over the pvmers too much then there'll be none left and no one gets to have fun.