I have to agree with Ray,IN, that it wasn't a fair statement. I can pretty much take apart and fix any thing that is mechanical. I have no fear when I do it. I often feel that when I'm not sure what the repair is, but have nailed it down as best I can to a part, I will replace that part, if it's reasonable (under $100) before I take it into a shop for at least a $200 minimum, just to diagnose.
Over the years, most repairs have been mechanical types, but now, everything has some sort of electronic component. I'm not as confident working on electronics, so I don't always jump into those repairs. I may have to hire someone.
With that said, many are just not confident that they have the ability to do repairs. I can see if someone tries to do a repair, makes it worse and maybe even make the RV unmovable. Now they have a huge bill on their hands.
As Clint would say....a man must know his limitations!
When I respond to a post where someone is asking how to repair something, I don't just say, install a new slide motor. I try to give step by step instructions, so if someone is on the fence about doing the repair, they can decide if it's something hey have the skill to do.
Lastly, I think the OP had the right idea to try and prompt people to give it a try, but I admire those who know their limitations. Many of them may not be handy, but are probably better at making money than me and can afford to have someone do it.