I guess they are receiving some criticism. I use FreeBSD and Linux. FreeBSD is very well documented and its easy to build the operating system and user applications from source. Of course this is possible with Linux, and used to be the only way to run Linux back in the olden times. But its not so easy to do in my opinion.
iXsystems: No one is being 'marooned' by Debian focus – Blocks and FilesTrueNAS producer iXsystems has encountered some user turbulence concerning a shift from a FreeBSD focus to Debian Linux.