There are better choices for me, but if it works for you, go for it.
Well, after over 3 decades of doing so successfully, I appreciate your permission..........
Permission has nothing to do with it!!

I have killed a bunch of Deer with less than a 243, killed several with 223, bow, etc. And a careful hunter could do that for 3 decades or 6 decades
if his health holds up. Especially if most hunting is local where if you don't get the right shot in distance or angle one day, you might the next. Actually, a person that has alot of time to hunt in a State like the one I could live in could tag out using a 223, keeping your shots under 200 yards & waiting on a broadside or decent angle & using the right bullets. Or with a little more time in the woods I could use an iron sighted 44mag handgun or my bow & tag out. Not a big deal.
Now, change the equation & say I want to be able to harvest a trophy when I see it at a range that I & my rifle can handle, do the same for an Elk, do the same for African Plains game
that I would like to do in a few years & the requirements change for me. Even for some of the Mule Deer I have taken in WY, I felt the 25-06 I was using was doing very well, but I see no reason for me to go down in caliber & no need since the 25-06 is a pussycat anyway.
So, I don't have anything against a 243, but for some of my hunts, it would be silly to use one, since I have better choices in my safe. No way would I grab one for a 1 week Western
hunt (limited time) when I can take my 300WM, .264 or my 06 or 270.
To each his own