Linux development is absolutely hampered by being a monolith. Getting involved in Linux development is notoriously difficult. The average developer won't consid

Linux development is absolutely hampered by being a monolith. Getting involved in Linux development is notoriously difficult. The average developer won't consider it even though there are many parts of the kernel which very much should be approachable. It is also hard to get some patches upstream if the goals of said patches don't align with everyone else's interests. There are even people exploring userspace schedulers to get around these challenges. There are also huge maintenance burdens that come from the lack of stable interfaces for modules. There is a reason there is a lot of excitement around ebpf. It is providing the sort of scaling that people have been needing for a while.