I’ve seen people do it, never done it myself though

The outer part of Eastern juniper will break down much faster than the heart wood.. Charing the part that touches soil will help prevent that because char (aka biochar) will never break down

If you have a pressure washer I've see videos that you can just strip with it. Works slick. Have to let it age a bit, but the bark strips right off.

Cedar would be my #2 go-to-multigenerational fence posts if I was making a fence, right behind black locust