I know what you mean. I was looking at getting all except the EFOS, and it was just over £2000 IIRC. It’s currently a toss up between getting that kit or an ONYX CTY2 bike. 
One big advantage I see from switching to AM from pretty much anything else except replicas, is the disconnect you would experience when finding the real world plane you get in doesn’t have any Logitech panels in! 
You can set up AM to replicate the instruments as they really are. Using “agnostic” hardware is not going to give you much if any muscle memory for process flows. You may know what to do, but may not have instant recall of where that button or switch is in the cockpit.