Nope. The biggest barrier is the FUD around there being so much variance. 99% of desktop Linux is glibc-based. Beyond that, binary compatibility is no harder than Windows. Differrent yes, meaning devs used to Windows have some learning to do, but not drastically different even.
That is, this is likely easily solvable, but it is most easily solvable at the beginning of a project by choice of base libraries. I can understand not wanting to change things after the fact for a presumably small user base.
They claimed that they'd need a different implementation per distribution. Which makes no sense. It's just open()/ioctl_tty()/read()/write(), all of which are in the libc of every distribution that has ever existed since the 90s.