You said wax removes wax and cannot layer it, that is incorrect as I noted before. Just wondering if you are auto detailer why are you asking about the wax harden issue? This is basic detailing 101 and every detail person would know this. Plus the wax over sealant is nothing new. Again same thing. You need to wait to harden before applying a LSP. This is why people pay you over $200+ to do a car
I agree it (price) is not always integral to wax quality but it again depends on what you are putting it next too. I tried zaino before and still stand by it is not worth what they get. No, sealant will last 1-year. Not gonna happen with a daily driver. It is hard to fine durablilty, shine, wetness, gloss and longevity all in one product. And most times not.
You know wax is not a sealant right? Your second paragraph seems to state they are the same...With waxes, for me, higher price = better quality. I tried enough to know. But a $15 wax is nice but lasts like very short. CG5050 has outperformed all waxes I have tried. And outperformed is not based on how long it lasts either. In the Texas sun, that says a lot. But if your $25 works, keep using it.
Based on the products I have tried JW wins (for sealant), hands down. But that is me. Price is lowest I have used based on about 25 to 30 DROPS to do a car. Shine is great, no bonding with any other LSP and no app issue in high heat or humidity.