Yeah I know, it should, it checks all the boxes of the initial list/link, imho.
here's a simplified device search https://openwrt.org/toh/start
you can send 100 links, if i have no clue what to look for it makes no sense
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Yeah I know, it should,
??? well it doesn't so how can i know or be certain?
the archer C2600 ?
Let's do the opposite, where are you, geographically.
Recommendation would/could be different based on where you live.
germany west border side, thats Holland
If it is https://www.tp-link.com/de/search/?q=archer-c2600%2F&t= you meant, i am afraid it is 'end of life' only 2nd hand available, what creates another problem: How can you possible test that...
Here it is shown though...
https://openwrt.org/toh/tp-link/tp-link_archer_c2600_v1#debricking
The help here is promising
I've got three of those - the four antenna model, the one mostly used have an uptime of 300 days.
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mostly used have an uptime of 300 days
And then what to do on day 301?
Make a toast?
Regarding used items, two if those three were bought from tp-link as refurbs, the 3rd was bought used on ebay.
But I agree, a new device would be nicer, and there are similar ones still being sold.
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Are you kidding? The device only works for 300 days? Because of OWRT?
The uptime ( = no reboot) is 300 days, not the maximum device age 
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ok that makes sense. 
I've read Supported Versions 19.07.8, for archer-c2600, but the current version OWRT is 21+
How long will it be supported?
No, stable is 19, current beta is 21.
The will be a 21 for the Archer.
Most routers are supported as long as the release image will fit the flash space available.
21 will not be available for most/all devices with 4 MB flash, depending on the hardware, this was already reality for 19.
Owrt currently fits a 8MB flash device, but recommends buying units having 16 MB flash.
The Archer got 32 MB flash.
Can you be more specific please?
Well, the netgear r7800 for instance, but now is really a bad time for getting such equipment, prices are elevated.
Or the ZyXEL NBG6817.
Maybe i should have said we are not into gaming. Just surfing the net + dl +streaming sometimes.
Do i understand correct you need to connect it to another router before installing? This can't be done by wifi?
The gaming thing for routers is just a sales gimmick, ignore it.
Which device are we talking about?
well i think i stick to a 2nd hand one, the 2600 you mentioned.
For linux there is an end of support date set for all Mint versions. Anything like that for 2600?
Is the source wifi 2.4 or 5 GHz? Is it ax, ac, or n?
And the most important question before buying any device that will be in line between you and the Internet provider, is what is the subscribed ISP speed?
hi mk24, thnx for youre question. This is what we have found:
2.4GHz wifi source and probably 5ghz too. All 3 are available: ax ac , n
Speed officially 10mb/s of course never had anything higher then 2mb/s Often around 1 mb/s which is fine. Lately hardly 100k which isn't ok.
Does the c2600 tick does boxes?