Multics : everything is a memory segment, just get out your soldering iron and wirecutters to begin porting Multics to your hardware today!
IBM: everything is a record type, we have 320 different modules to help you deal with all 320 system-standard record types, and we can even convert some of them to others. And we have 50,000 unfixable bugs because other pieces of code depend upon the bug working the way it does ...
UNIX: everything is an ASCII byte. Done
I started writing code in the 1970s on TOPS-10, TWENEX, PLATO, and my undergrad thesis advisor helped to invent Multics. The benefits of UNIX are real, folks, the snake oil is the hardware vendors who HATE how it levels the playing field ...