You are right about the OP not needing any Asus features since he already has a router. If EAP610 fits his needs it was surely the smart choice.You're doing scripting on your APs? Or you're saying that you want scripting on your main router thus have spent money for all Asus/Aimesh nodes in order to keep that?
The OP here has a PFSENSE router and was just looking for wifi to add to it, the PFSENSE can do all the advanced features (and more) that Asus scripting can, but to take advantage of guest segmentation you need VLANs, which only the Asus Pro routers have (at least out of the box, in the GUI). They stated the EAP610s they bought are giving them double their old AC performance for half the price of the Asus they would have needed with VLAN support. In this case, it was the right move.
There are plenty of semi-pro grade APs out there for $100 or less each. Even Cisco ones are in the low $100s if you find the right place to buy. Perhaps different in the EU but in the US it is very easy to get good APs for reasonable prices.
If you're just looking at out of the box mesh systems that include a router and have some support for more advanced stuff, then maybe the Asus is right for you, but that isn't the case for all.
Buying an Asus router that cost the double could interest some people who need faster speeds at distant rooms and security updates.
In Europe 4X4 semi-pro grade APs cost similar to Asus routers on Amazon sales, i am really curious about their performance after reading this thread. I hope i don't do any impulse buy again...