Out of the 150k patents issued each year, the number of patents that actually get challenged is tiny (less than 1000. Patent courts are very likely to side with the inventor and even more so if the inventor is a private individual rather than a company - the attorneys helping inventors file patents like to overstate the value of their guidance. They are salesmen trying to preserve their jobs.Having worked on several patents with good patent attorneys I know that writing a defensible patent is very hard work and requires knowing what practical effect of your device. If you can't describe what something does your patent, even if accepted, is going to be very hard to defend.
As an aside, I still find it irksome that people will come here soliciting free consulting, first without saying that's what they are doing, and second expecting to make money from the work of others with no intention of compensating them. If someone says, "I am working on a device and can't disclose what it is and have the expectation of making money from it, but won't compensate you for helping but I would appreciate your help." Then people could choose to help or not with informed consent.
Not saying so up front seems underhanded to me.