It would help if plugins page showed if a plugin is 4.4 compatible not only 4.x

The New Retrograde plugin works here in MU4.4.2

While we are at it: now there are only 4 plugin categories:

static KnownCategories categories {
{ "composing-arranging-tools", TranslatableString("extensions", "Composing/arranging tools") },
{ "color-notes", TranslatableString("extensions", "Color notes") },
{ "playback", TranslatableString("extensions", "Playback") },
{ "lyrics", TranslatableString("extensions", "Lyrics") }
};

Isn't this somewhat restricted? e.g. where to categorize the 'Harmonica tabs' plugin? In composing-arranging tools?

The naming is easy to fix, in the plugins.
The issue stems from the different methosds used in MuseScore 3.x, 4.0-4.3 and 4.4+ ans the plugins developers' desire to maintaine onle one version for all 3 of them.

Typical code:

   description: "This plugin colors the chords and rests of each voice"
   menuPath: "Plugins.Notes.Color Voices"  // Name for Mu3
 
   id: colorvoice
   //4.4 title: "Color Voices"
   //4.4 thumbnailName: "color_notes.png"
   //4.4 categoryCode: "color-notes"
   Component.onCompleted : {
      if (mscoreMajorVersion >= 4 && mscoreMinorVersion <= 3) {
         colorvoice.title = "Color Voices";
         colorvoice.thumbnailName = "color_notes.png";
         colorvoice.categoryCode = "color-notes";
      }
   }

description, thumbnailName and categoryCode are optional

A plain Mu3 plugin just needs

   description: "This plugin colors the chords and rests of each voice"
   menuPath: "Plugins.Notes.Color Voices"  // Name for Mu3

A plain 4.0.-4.3 plugin only needs

   Component.onCompleted : {
         colorvoice.title = "Color Voices";
         colorvoice.thumbnailName = "color_notes.png";
         colorvoice.categoryCode = "color-notes";
      }
   }

A plain 4.4+ plugin only needs

   title: "Color Voices"
   thumbnailName: "color_notes.png"
   categoryCode: "color-notes"

But one version stumbles accross the methods needed by the others, so you end up with the top example.