He is not that bad, the issue is that, as all foss devs, he is not interested in solving problems he does not feel like are important.

The problem is, he disapproves when resources are allocated in his project to those problems and one main area he is not a fan of is support for legacy stuff.

It just happens that legacy stuff is the majority of the industry, as production environment of half the globe needs to run legacy software and a lot of it on legacy hardware