The more I think about it, the more I think a lot of it depends on the printer you are using, cartesians are a lot less likely to head crash. While a delta sends the print head flying at high speed right towards the center of the bed, I doubt you would find many, if any, operational deltas that haven't crashed the head at least a few times.
In my case, both of my deltas are using the hot end as a probe for calibration and leveling, so my head is repeatedly touching the bed (not always gently). One is a large scale printer with an 18in (500mm) diameter bed, coating it with Kapton and plexi would get expensive knowing you are just going to pummel it with the head in various places.
In my case, both of my deltas are using the hot end as a probe for calibration and leveling, so my head is repeatedly touching the bed (not always gently). One is a large scale printer with an 18in (500mm) diameter bed, coating it with Kapton and plexi would get expensive knowing you are just going to pummel it with the head in various places.