Unix may be fine by 1960s/1970s standards, but leaves a lot to be desired now, or probably since the 1980s. Unix has bad approaches to things like file locking

Unix may be fine by 1960s/1970s standards, but leaves a lot to be desired now, or probably since the 1980s. Unix has bad approaches to things like file locking (see VMS instead), the shells are a hot mess, and C causes a lot of problems. Even the Unix developers themselves went on to work on Plan 9.