In my opinion router reset is needed only in very few situations when something went completely wrong and the router is not communicating and is not accessible. I see a trend here on SNB to recommend a reset for almost everything without even trying to help the user by asking the right questions. Just reset and start over is a wrong recommendation without identifying the issue in the first place. It sounds to me like "buddy, we are pros here, don't bother us with your stuff, just start over". I see reset recommendations in every thread now, no matter what the issue is.
If that is what you are getting out of it, you are reading the posts wrong.
Nobody knows the state a users router is, nor what steps were taken to get there. The user themselves couldn't tell you with any certainty in most cases how the router got there except in broad terms. Even a brand new router is not as in a pristine state as most users believe they are. Today's returns, exchanges, and even manufacturers own testing can leave a router with inter-firmware glitches that given a certain configuration, will show up as insolvable bugs or even hint at hardware failure when they're not.
What does jump out at me is when all other reports of a similar configuration just work, yet a particular unit doesn't. That indicates that a router is in a very unstable state for any of the possible reasons above.
The fastest way to get out of that state is a full reset to factory defaults and progressively more 'nuclear' attacks on it, as necessary. The reality is that a basic reset to factory defaults is only a few minutes saved vs. a full Nuclear Reset of the router itself. Meaning, it is usually faster to perform the latter than to perform both (as is usually seen in users posts).
When I go to a customers site and they just want their network running as optimally as possible with the equipment they have, a Nuclear Reset is the most professional option I can offer them (but, I don't call it that, of course). This is not a 'don't bother me' type of response! My proof is that I very rarely get called back to those customers. And when I do, the fix is usually a 15-minute process, at most.
Of course, I spend 10 to 30 minutes or more (when customers try to explain things to me) to be sure I understand the issues I'm trying to fix before recommending a full reset, but usually, I find that is wasted time because almost any fixes I try at that point do not stick (at least not permanently) and rebooting the router isn't something the customer wants to do either, indefinitely.
Speaking specifically of Asus routers powered by RMerlin firmware or not, a reset is necessary when the router isn't responding as it should (not necessarily as the user
fancies, but when it doesn't respond within it's designed specs and firmware capabilities) and a reasonable search for fixes comes up empty-handed (or, the fixes presented simply don't work on that router/network).
There are a few posts here on these forums where a full reset brought a router back to life when all other indications seemed otherwise.
https://github.com/RMerl/asuswrt-merlin/wiki/Installation
From the link above.
- If something looks weird, don't waste too much time: save your settings, reset to factory default, reconfigure the basics, and see if the issue is resolved. If not, you can always restore your saved settings and do some more advanced troubleshooting.
- It is not recommended to restore settings saved under a different firmware version. It might work, but there is no guarantee.