One of the major problems observed in getting contributed modules Drupal 10 compatible was maintaining support for Drupal 9.5, which remains in security support (or remained if it is now past November 1, 2023.) Contributed modules should be compatible with all security-supported versions of Drupal core or more if they so choose. This can be difficult as Drupal 9.5 contained deprecated code removed in Drupal 10. It was up to maintainers and contributors to find workarounds and copy-pasting tricks using if/else statements with version_compare.
If you're interested in these challenges, I recommend catching my talk from MidCamp this year – Lessons learned from helping port the top contrib projects to Drupal 10.
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