Any manufacturer does what it can to make a profit not only for itself but (primarily) for its shareholders,
first. With that in mind, model numbers aren't supposed to make sense, nor are new releases automatically better than anything already released previously.
And, more importantly, it's always,
caveat emptor. I do not know any manufacturer that claims any specific product will work ideally for all customers.
The GT-AXE11000 is an older model. The GT-AX6000 is much newer. Don't forget the lead time to design, manufacture and release new products (it means they are much older 'tech' than their release date would indicate).
Right now, for me, the GT-AX6000 with RMerlin support is superior to the paper-spec 'better' GT-AXE16000.
Buying products on assumptions is never a promising idea. And buying a protection plan with it is also artificially increasing the price for no good reason for me (particularly in the sub $1K price point). Most products (particularly 'tech' products) either fail within the return period, or within the manufacturer's 1 (or 2, or 3, or 5) year warranty period. And 99.9% seem to last indefinitely afterward. A protection plan is simply free money for the reseller, with a handful of exceptions.
The hardware may be the pinnacle of what we want/is available today, but without the software/firmware side, it is an empty promise. Just like a MacBook Pro may be the superior
hardware, vs. a PC laptop, the limiting o/s makes it far less than ideal for me too.
You're more willing to bet than I am with these devices, and you seem to have a bigger budget than me too!
I truly hope your assumptions pan out as you wish (it will be good for all of us).