I leave them in the tire (road and gravel). I never had any issues.

Leave them in. My record is 6.

I too leave them. Thus far I’ve experienced zero issues for a road tire (85psi) and wore that tire through (think around 1800 miles on the plug). On my off-road (55psi); I have two plugs on the top side of the side wall (just below the thicker belt protection) and no issues with lower psi and taking gnarly corners in gravel where I initially hesitated thinking it may snag on the plug.

I leave them in, the rubber plug-tail gradually wears down, but I do find that after a few rides I very often get another puncture in the same spot requiring another plug. Worst is that the metal tip is then loose inside the wheel, making a very annoying rattle, so I have to take a bit of the tyre off the rim to extract the loose metal tip.

Thank you for the feedback!

MTB use case here. Plugs often last longer than the tires. Sometimes they also self-generate slow leaks. Nothing a pre-ride pressure check doesn't solve. I leave them in and hope for the best.

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I personally take them out at some point, patch the tire and that’s never failed me