My career is supporting business Linux users, and to be honest I can see why people might be reluctant to take on the Linux users.

"Hey, we implemented a standard partition scheme that allocates almost all our space to /usr and /var, your installer using '/opt' doesn't give us room to work with" versus "Hey, your software went into /usr/local, but clearly the Linux filesystem standard is for such software to go into /opt". Good news is that Linux is flexible and sometimes you can point out "you can bind mount /opt to whatever you want" but then some of them will counter "that sounds like too much of a hack, change it the way we want". Now this example by itself is mostly simple enough, make this facet configurable. But rinse and repeat for just an insane amount of possible choices. Another group at my company supports Linux, but just as a whole virtual machine provided by the company, the user doesn't get to pick the distribution or even access bash on the thing, because they hate the concept of trying to support linux users.

Extra challenge, supporting an open source project with the Linux community. "I rewrote your database backend to force all reads to be aligned at 16k boundaries because I made a RAID of 4k disks and think 16k alignment would work really well with my storage setup, but ended up cramming up to 16k of garbage into some results and I'm going to complain about the data corruption and you won't know about my modification until we screen share and you try to trace and see some seeks that don't make sense".