This actually kind of happened to me. My iPhone 12 Pro was stolen out of my hands last year in July. I had an Apple watch, but decided to replace the iPhone with a Pixel 7 Pro [1] since it was a bit cheaper than replacing the iPhone and I didn't have a job, and as a result my watch didn't work. Initially I was happy enough to use a dumb analog watch, but shortly after this happened, I was diagnosed with sleep apnea and wanted something that would track sleep. I ended up getting a Garmin Instinct (per a recommendation on HN actually).

I gotta admit that it would have been pretty nice to not have been forced to buy a new smartwatch, and just use the one I already had. I love the Garmin Instinct, more than I liked the Apple Watch [2], it's a very good, well-made product, and I'm happy that it appears to work fine on iOS and Android, but I really didn't need another watch. If there hadn't been an artificial limitation forcing me to get another watch, I would probably still be using the Apple Watch.

[1] I don't have that phone anymore because the Pixel 7 Pro is a horrible product that Google should be ashamed of themselves over.

[2] In no small part because the battery is like 16 days instead of the 1.5 days I was getting with the Apple Watch.