I can't really understand why, but sadly this little note came up when I tried to thicken up my wire widgets. I did test Blender 4.3 to see if it was introduced later, but sadly not yet.
Leaving this here just in case fellow mac users don't notice the note with a small panel. I was trying to figure out what happened and only noticed it when I expanded the properties panel.
Yeah they added that message in 4.2.2. Apparently the geo shader they use to make the width larger is not available on Mac's metal. They are trying to figure a workaround.
Ha! I would never guess that was the reason. Crazy how little I know of what's under the hood in Blender. Thanks Dwayne