Originally Posted by Vic_in_Va
It's up to you.

I shot deer for years with 3rd tier glass, but now that I can somewhat afford it, I do like the better glass.
I killed multiple deer every season with iron sights for many years. Some in excess of 200 yards and some on the run. Though a scope does offer advnatages over iron sights, they're still not mandatory for my success. I'll fill my tags with or without.