Yeah, if you've got new equipment it's hard to justify replacing it.
It looks like you've got a nice setup. the first thing you should ask yourself is what you want to do with a controller. It's easy to get caught up in all the gear in this hobby, but it's expensive enough without getting stuff you don't really need. Controllers are nice but absolutely not a necessity for most people. I liken them to a smartphone - life was fine before we had them, but now that we have them we don't know how we lived without them.
Looking at your equipment, you have a solid ATO, a good powerhead and a good return pump. I'm pretty sure the Vectra pumps have a feed mode built in, and your lights can be scheduled on their own. If you don't get a controller I'd get a separate controller for the heaters, like a Ranco or an Inkbird, but you can do just fine with what you've got right now. A controller can definitely help track and automate certain things but in many ways I think you're better off starting out without one so you get a better feel for what needs to be done.