Yes many do and what you will find is people have to pay money for them which pays for the development.Many games have major expansions a couple of years prior to the sequel, like Destiny.
That said, some games just keep evolving like WoW.
Hard to guess which way FDev will go
Beyond is not paid for at all and if it is ED 2 next year then all this money being spent on ED is down the drain without anyway to get it back. Looks like poor business to me.