Methinks all this buzz about comping in "other" airlines FFP is somewhat strange. Would you like anyone who did most of his biz with another carrier getting comped to your status with your FFP ???
You had been a loyal customer and did spend a lot of money and / or energy (mileage runs) to really earn your status, right ???

Exception IMHO, if you are a high flyer and really planning to switch your loyalty.But just for fun and / or to collect some more vanilla or purple cards ???

Comping = devaluating !