Sure, but the mini will even have Thunderbolt 5, if that strikes your fancy. It'll also still be $1,500 less. (But yes, overall fewer ports, though this doesn't matter that much on a desktop. Just have a dock nearby. For example, IMHO, HDMI is useful on the MacBook Pro to avert embarassing "I'm trying to present something at a client's, but they only have HDMI, and I don't have an adapter" situations. But on a desktop, you either need HDMI, in which case you'll have an adapter/dock/hub, or you don't.)
Yep.
Although I suspect the Studio won't be coming for about half a year. Perhaps at WWDC, which is eight months out. But once it does get released, we'll probably be back to the situation where there's a nice gradient from mini (M4, M4 Pro) to Studio (M4 Max, M4 Ultra), at probably similar price points $599, $1,399, $1,999, $3,999.
So if you need a desktop Mac with decent mid-range performance soon? Get the mini.