I suspect Airport Utility will remain viable until it is no longer compatible with MacOS/iOS/iPadOS but it is no longer under development, and to the best of my knowledge it is no longer supported.

I have a lot of "Home" devices that do not play nice with a mesh network so I use my old Time Capsule to generate a dedicated 2.4 GHz network just for them and replacing it would be a real pain 🤬, so I hope that Airport Utility remains viable for a long time and my Airport hardware doesn't decide to quit on me.

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein