I happen to know by actual experience and not gouge (what other people are telling me). The simple answer here is: flight hours does help, with selection (depending on who’s sitting on it) and definitely in training (if you’re disciplined and open to learning). Most students don’t have previous flight hours so it’s something that they don’t really understand or can compare.
You can take it as you want and believe what you want to help you cope. Sure, you can wait til primary to get started. I also don’t see a disadvantage in someone else getting flight hours because they want to. They should want to get into aviation and grow that passion. Anyways man, hopefully you can be in my shoes someday and get selected (and do well in flight training.)