How do modern cars regulate temperature so well?

So......
Looks like I have enough radiator and fan.....gauge is pretty accurate too.
Modern cars are probably BS'ing me.....
Might improve with EFI controlling AF and timing.....

Stop worrying about it for now?
210 is absolutely fine and safe...220 no good?!!!

Jeff
I don't like my older cars to reach 200* That's just me......