[tellarin]

I made the switch from Researcher to RSDE and I'm not sure what you're talking about.

There are plenty of Principal RSDEs and some become Managers of technical leaders of teams, which sometimes even include researchers.

But of course, the track is not as clear and common as for plain Researcher or SDE (in a product team).

PS: As far as I know, the patent bonus are there for all (though I can't comment on values).