I would give up my rear suspension before giving up my dropper post.
I find that it’s a matter of efficiency more than anything else. Leave it at full height for efficient climbing, and get it out of the way for gnarly stuff. In varied terrain I find myself constantly adjusting it without thinking about it. Up a little for this section, down a bit for that. It’s intuitive and keeps my butt in just the right place to conserve pedaling energy wherever possible.
BTW I’m 5’11” and use a Crank Brothers Highline which has worked perfectly since I bought it last year.