It's because Copilot isn't (just) a model, it's a brand that's been slapped on any old rubbish.
If Clippy were still around, that'd have been rebranded as Copilot by now.
If they resurected Clippy and made it the face of their Ai I would switch in a heartbeat.
If they resurected Clippy and made it the face of their Ai I would switch in a heartbeat.