The RT-AX86S is crippled. Hardware-wise.
The RT-AX68U is suitable and priced correctly (when on sale, particularly) for ISP speeds ~600Mbps or lower. With great coverage, excellent low latency (for its class), superior throughput for its price point, and proven dependability and reliability. It may only have 512MB of RAM, but when used as it should be, it doesn't need more. And although the CPU is only dual-core, it is still at the same 1.8GHz speed.
There are some odd regressions being discussed on the dnsmasq-discuss list from the PiHole guy (Dominik). https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q3/015598.html https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q3/015596.html I see Merlin is testing 2.86 out...
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The RT-AX86S has half the RAM of the original RT-AX86U, is only a 3x3:3 RF design for the 2.4GHz band, and two years later, is still only offering a single 2.5GbE Port. The much older RT-AX86U (orig) can be excused for that faux pas because of its age (but today, it has almost been 100% confirmed that it won't receive 3.0.0.6.xxx level firmware going forward, so it too is not on any recommended list today).
Even if someone buys the RT-AX86S today because they believe 'that's all they need', they're simply ignoring the fact that for a few dollars more, they'll be able to get the superior RT-AX88U Pro which will not only benefit them during their time with it, but it will also be worth more when they may be looking to give it away, sell it, or re-use it when they eventually upgrade.
Yes, the RT-AX68U is not trying to be anything more than it is. But the RT-AX86S and RT-AX86U Pro are both well past their prime (even when they were originally introduced).
I have an ASUS RT-AX88U WiFi router. It doesnt currently support VLAN. So if I update the firmware with Asuswrt-Merlin one (RT-AX88U_3004_388.6_0) 1. Would I get an option to setup VLAN? 2. Would I be able to use AiProtection? 3. Would I be able to install OpenVPN clients? 4. What all...
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Having/not having the ISP speed (today) or having/not having the client devices (today) isn't a reason to buy inferior hardware.
Particularly when buying a superior option (RT-AX88U Pro) is just a few dollars more (and depending on sales at any specific time, even less than those crippled and obsolete models that should be avoided today).