[users] Chirp with Yaesu radios

I have an FT817ND and an FTM7250DR, both of which are listed as supported radios. However, I have seen a number of posts on the internet from Yaesu stating that using Chirp with Yaesu radios may damage them. On the 7250, Chirp uses the clone mode of the radio which, to my mind, is a very safe way to go. I am not sure how it works with the 817. I would like to use Chirp with both but I am, of course, worried by the Yaesu statements. Are these statements still valid? Or have they been invalidated by progress within Chirp? Or were they not valid in the first instance but a reflection of some other issue? Thanks for any information on this. Howard, VK4BS