I have no experience with Open WRT, but I can confirm that, TP-Link Archer A7 is working great with DD WRT.
I can vouch for TP-Link wireless products in general. So far I've used 2 routers and 2 usb adapters (even drivers are working fine with Windows 11 and Ubuntu MATE) from TP-Link, and none of them had any problem whatsoever.
Regarding performance of Archer A7-V5, I'm getting full 100 Mbps (my ISP connection speed) through this router on my phone, and this is 3rd router in my setup. First being ISP, then ASUS and then Archer A7.
I'm running Archer A7-V5 for over a year with DD DRT. In fact, I've just upgraded it to July 8, r53221 build right after reading your post. Firmware files for r53221.
Well just recently I read that Putin/Russia's troll farms are on the down low... now all those anti-democratic, anti-peace trolls not gonna be a good, honest, hard working humans all of a sudden.
So Lemmy.ml/Lemmy.world admins better opt for "special defederating operation" :)
Edit: Now this may not be a popular opinion but I like to compare this to the real world situations.
Why European Union not openly allowing anyone (even from within Europe) to join them without any conditions whatsoever?
Why Biden just mentioned "Democratic situation in Ukraine" in regards to Ukraine joining Nato? (Just to clarify, he's not against it, he just wanna go through due process)
Since Fediverse is rapidly growing day and night, I would say, it's better to protect Lemmy Communities from the get go from Russian/US Republican/Corporate troll armies.
Just my 2 cents.