Hi all,
as in other industrial products, jacks and plugs have tolerances. The TRS plug tip has a special form that helps to "lock" into the jack and provides a certain force against unwanted extraction. The jack has springy contacts that take up the tolerance between jack and plug. If you use a plug that is at the upper tolerance limit and a jack at the lower limit, it may happen that those contacts are permanently bent. There is also the possibility that the tip form is not as expected by the jack manufacturer and therefore the extraction force is low.
Personally, I prefer Neutrik connectors, since their quality is consistent and they have a reputation to lose, so I expect them to build to tight tolerances.
Risking an expensive recorders input jack with sub-par plugs is not what I consider a good idea. Both my M10 and my D50 see only Neutrik connectors at their inputs. Even at max gain and (carefully!) rotating the plug in the jack there are no noises or dropouts.
Other than using quality plugs, handling the components of your recording system with care is important. I have mics that I bought 25 years ago that are still in full working order. My WM-D6C of the same vintage looks like new, but the belts of the drive are getting old and lose their tension. Oh well, rubber ages...
Greetings,
Rainer