For the most part, it is a marketing ploy. There are a couple of products that may be easier to apply but sunscreen is sunscreen.
We are in the manufacturing industry selling raw materials. It is almost comical about how some people are so uptight about plastic bottles, etc. and BPA. To get enough BPA to hurt you, you would need to inject yourself with it daily, LOL..
BUT, it is an opportunity to "redesign, reformulate, etc" which bottom line changes very little to do with the plastic but people think is is OH so safer and realistically, it is just more expensive.
This marketing scheme, scare tactic goes around with all types of products. They rely on people living in fear and spending more money. And it works!