FYI; just posted this #featureRequest on Github:
https://github.com/tootsuite/mastodon/issues/6828
"I love the pinned feature, but when using it extensively, IMO it should not push the latest toots out of sight.
I therefore suggest to put only 1 pinned toot in front of the normal toots/boosts/replies, and the rest of the pinned toots in a separate column titled "Pinned:" along the right side."