I think you want a middle ground.
There are some things you can wait out.
There are some things you can't.
Sometimes a bribery is appropriate.
Sometimes it is a slippery slope to needing more and more and more before obeying. (Have you ever heard a parent saying "If you tidy up before I count to ten then you can have a biscuit. 10.. 9... That's not working. If you do it before I get to 0 then I'll read you a story... okay not bothered by that... would you like...")
There are some times when it is appropriate to reason, and explain to a child. However there are times when you can explain your reason and the child can say (in their own way) that they completely understand your reasons-but still won't do it.
Heck, you can explain till you're blue in the face why chocolate is bad for me and that doesn't make me want it less. Adults don't always do what they know to be the best thing for themselves, so why should children?
There are times that they need to know that you are in charge and you won't compromise on. (Like going in the car seat).
Often when they know that it is a no compromise position they will do it without fussing (too much).
If I need to pick up dc2, and dc3 refuses to get into the car seat. If I spend 30 minutes reasoning, then dc2 will be left worrying I won't turn up.
I am open for discussion (eg. If I have the apple now, before dinner, then I will have it instead of pudding after dinner)
But some things I cannot wait for strops/discussions. So with eg dc3 getting in the car to fetch dc2, I give 5 minutes warning, then ask to get in.
If no movement, I say "you need to get in now" and start counting.
If I hit zero, then he is picked up and put in. Often he'll start moving as I start counting, and ask for something (toy/snack) to take in the car. If he gets into the car before I reach zero, then he can have it (within reason)
I don't think generally going straight to the physically putting them in is good. Has been done when I'm in a hurry, but generally giving a chance for them to do it on their own, to me, is best.