Well I also never had problems with neither my RX2/3 nor my RX300 and also know plenty more who haven't, but at the same time also know others were not so lucky. Sometimes it was just user error like, for example, spilling juice into the 510 so that the 510 pin got stuck and didn't move back up. Then, putting a very small drop of vodka on top of the 510 pin would loosen it up enough to be able to gently wiggle it back up by using the sharp tipped (curved) tweezers that come with the Coil Master Kit v3. Only sometimes, the amount of juice spilled was gargantuan so the board inside the mod literally was drowned in it and, and, as a result from that, got burned to a crisp. Or, for another example, the user screwed on an atty the 510 of which is too long so that, without adding a washer of sorts between the atty and mod, the 510 pin of the mod got pressed too far down, in which case the little vodka trick became useless. This particular example is also user error because the user manual of the mod clearly states that. But some people can't read I guess, and, despite that there ARE some vapers who can't read, myself included sometimes (sometimes often) due to too many clouds clouding my vision, the insufficient travel on the 510 pin is a limitation still nevertheless. I.e., I can see (for real) how this could very easily be a dealbreaker to many who CAN read so because Wismec was able to see it too, the travel on the pin was increased by design on the RX300 compared to older models, and increased further still on the RX Gen3.
Other times, it was not user error because the wire had simply broken off at the solder point that's on the bottom of the 510, or something like that. Now, because some (or a lot of) people don't know how to use a soldering iron without actually burning down the house... you get the picture. Same deal with the screw threads on the Predator 228, i.e. if you absolutely can't handle the JB Weld stuff or super glue without gluing your ass cheeks to the seat of your chair on accident, then there's only one valid conclusion for you: tough luck, don't buy a Wismec, go smoke some cigarettes instead or do something else, like learn how to build coils that don't have a crazy long ramp up time and that you can be happy with how they vape... (and still smoke cigarettes whilst learning how to build those coils) or just live with the crazy long ramp up time because like I said tough luck... unless you're a tootle puffer just like the OP, you're going to miss out on ArcticFox firmware and the fact you need it in wattage mode for you to be able to make sensible use of the preheat feature. Or maybe, for whatever the reason you prefer, you don't need wattage mode and you don't need preheat and you don't need a power curve to be used for preheat. That's fine. As long as you don't let his lordship the OP mess with your decision of what works for you vs. what doesn't. That's because one thing's perfectly for sure: his pseudoscience doesn't work.