What ASUS WiFi Gaming Mesh Router RT-AC1900P? This one?
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This was an RT-AC68U variant exclusive to BestBuy in USA/Canada. Based on >10-years old technology and perhaps soon will be EOL model. You already invested in 2x almost EOL routers (RT-AX92U, no firmware update for 1 year)... why investing in more?
Yes. The only reason I
invested in this is I got a 2 pack
new units for $110 at Amazon and has AIMesh. Single unit sells almost one and half times that (including in the above link which lists it at $139.99).
I had got the 2 pack
new AX-92U for $250 (to be fair I knew nothing of mesh or AIMesh when I purchased AX-92U. I just purchased the two pack due to the price as single unit was listed around $180 to $190) which now either shows out of stock or lists for almost $374 on Amazon or are used units if it is lower price (somebody returning it probably due to the reasons you mentioned).
I learnt about mesh in general and its advantages only after the AX-92U purchase. By the way, I have started liking ASUS routers

due to better firmware features, better mobile app, option of Merlin which is ASUS firmware with added benefits and to some extent AI Protection Pro for
lifetime of router unlike other companies who have paid subscription after free trial or free year
I can't understand the router pricing these days as the latest models are pretty expensive

for whatever reason. May be supply chain issues are still persisting.
My existing 2015 TP Link purely used as an access point is acting up frequently now and needed something to replace it for a good price point.