I agree that a well-done git rebase and commit strategy is much more useful. However, squashing everything will (most likely) lead to gigantic commits that are hard to reason about.

A better approach would be to create multiple small commits that work and are self contained. It's ok for commit N to depend on the preceding commit, but each N should be able to stand on its own.

If devs rebase everything before pushing and push often (therefore also rebasing often), conflicts will happen a lot less often. Devs can also use their private branches for temporarily saving all WIP, squashing/rewording only what makes before submitting the PR or pushing to master.