I'm in this camp too. If the plug were to fail you're just in the same situation as before (a slow leak) and you didn't crash then. Plus, with my luck, I'd put on a brand new tire only to get another puncture straight away. Then what - yet another new tire?I'd put a string plug with glue if newer tire. Its not like its gonna blow up, and you have tpms to monitor it and if it leaks it will be slow. However I respect everyone has different opinions.
I've had very good success with the sticky rope plugs. Never had one fail (on road bikes or dirt bikes). I always carry them in my kit.
But I respect other people's decision to replace the tire. You have to feel comfortable with your choice.