I too have started using linux some time before systemd adoption, but because my work involved a lot of system administration and infrastructure administration simplicity of sysv-style and bsd-style inits was detrimental to my mental health, so when systemd came it was something from another world, tickled me just right and documentation was insanely good and detailed, and it absolutely changed everything. There is also an obvious problem of people reductively thinking of systemd project as a whole as an init system, it isn't just that it's a system management system and it works great. Other systems just doesn't use what linux provides and instead reiterate on old designs.