After looking out that door for years and seeing some of the strange things that can happen out there I have always owned my own flotation set up with a strobe and a transceiver.
When ever I would go out with some one else I would always take my own stuff.
Some guys thought I was nuts but most guys keep jackets and vest stowed under seat etc and don’t start breaking it out till weather builds....I like to have mine on the ready
Sounds like you have the creds to fend off any derisive commentary. The thought of treading water alone, out of sight of land with darkness falling is kind of...horrifying.