best to avoid all in one units in my opinion 250 is very expensive also in practical terms the ac88 and ac87 are no better than the ac68
This is also my view, there is definite logic in separating modem, router and WAP. Main problem I find is that "normal" people want a one-box solution, I guess you can understand this from a convenience point of view.
My mum, for example, has no idea there is a way of accessing her router (at all) and just uses the default settings on the "sticker" and the switch on the wall socket to reboot it

After some initial optimism, my RT-AC68U was relegated to a WAP a couple of years ago after the issues I encountered with it. Steering clear of Asus stuff now.
I wonder what the most bomb-proof "Granny friendly" all-in-one modem-WAP-router is?
Chunks