It’ll support 12th and 13th gen out of the box. Look up your board’s support page on Asus’ website for compatibility list and BIOS updates to enable 14th gen support.

Obviously yes. Heck, this subreddit still sees a lot of people on 4th-8th gen asking for upgrade advice.

If the price is right, why not? There have been some pretty good bundles lately. (At least, in North America)

Who explains architecture to normal people? All you have to do is tell them if it’ll run what they want to run, and how well it’ll run.