I have a single digit number of posts on this place but I have a lot of experience of internet communities, going right back to Usenet.
One of the things I’ve learnt over the years is that on forums and the like, if one wants one’s membership of any forum that is fundamentally good hearted to go well, one should be more ready to apologise for creating a misunderstanding and/or accidentally offending someone, and more graceful in accepting an apology than one would be in face to face communications. Courtesy is a vital lubricant to a forum’s machinery*.
In engineering hobby forums, where there are often well known best tecnical practices, there also has to be a willingness to explain those best practices to beginners, explain the underlying reasons for those best practices (and if one doesn’t understand the underlying technical reasons, including at least a basic grasp of the physics involved, one is not talking engineering, one is talking superstition) and state the consequences of failing to follow those best practices.
If the recipient of the advice chooses not to follow that advice (providing safety isn’t an issue, of course), one then has to shrug one’s shoulders and say to oneself (and only oneself) “Eh, your part. If you scrap it after an hour’s work, then it’s your time wasted” and walk away from the thread.
As for technical advice given by those who have never used less rigid, less capable benchtop machines and the appropriateness/usefulness of that advice. Well that comes down to person giving the advice.
Some will provide the fish they know and some will teach how to fish with any rod.
If someone answers a question without showing the OP the respect of understanding their original question (and often the best answers come after a few back and forth questions) and that answer is inappropriate for the machine tool the OP has then, no matter how much personal experience the answerer has in their life of machining/model making, their answer is a poor one and deserves correction.
That correction should be given kindly and most importantly taken gracefully by the answerer; they should hold humbly hold their hands up and say to themselves “I learnt something new today; that’s a good thing”
Anything else suggests that person believes they have all the knowledge worth learning.
Humility and an awareness of the incompleteness of our knowledge should be at the heart of all science and engineering.
Finally, one other thing I’ve learned is that “I’m leaving” posts are best ignored, or at least gently and kindly mocked, in the way that one would humorously pull the leg of an overly-dramatic but well loved brother or sister.
*And yes, I know, I know. There’s a time when someone posts something so egregiously and arrantly wrong, it’s almost offensive and one has so little respect for the idiocy of the opinion, one wants to tear the post apart, until there’s nothing left but the shreds of the foolishness, blowing away in the wind of one’s righteous rage.
If one is lucky, it might provide a hollow satisfaction for a short time but never peace. If one is unlucky, one’s understanding of the post in question is at fault, and one looks like an utter idiot.