I recognize that not everyone wants or needs a QD mount or may only use them on select rifles for a specific reason. So here is the poll. Up to two votes and you have to vote to see the results.
I answered first option, all my rifles have QD mounts. And I never had a problem with them.
But the answer is more complex then described.
Modern standard is rifle without iron sights. Sightless rifles are pandemic everywhere
The idea must have originated in USA, because many such rifle get title "American"
This type of rifle without iron sights is win-win design for factories and for guns hops.
Factory makes cheaper rifle competitive on market, because they dont bother attaching the iron sights, and it simplifies production process.
Gunshop owners love the concept.
Because rifle without sights is useless so the costumer will need immediately to look for mounts and scope, or red dot, and buy.
Just wonderful for them.
Me, on the other hand, I am of the idea that hunting rifle must have iron sights as a backup.
If the rifle has iron sights, then it must have QD mounts.
Thus all my hunting rifles have iron sights, and QD mounts.
All my iron sights are zeroed, and scopes are zeroed.
And removing the scope and attaching again, does not change point of impact. Various types of mounts: on picatinny, dove tails, German swing mounts, block mounts, etc.
Some rifles I use for shooting matches or practice do not have QD mounts.
Because they do not have iron sights, so they do not need QD mounts.
And this is fine with me.
So, the answer is:
I have QD mounts on all my hunting rifles, and all of them also have usable iron sights which is the main reason for QD.
African perspective:
Additional benefit of QD mounts is to remove the scope, and keep it in cabin luggage for protection during air plane travel.