it has no more trouble installing third party software, accessing the underlying filesystems, or communicating with remote systems than a Windows system.
Have you tried creating a local account on Windows 10? Microsoft has made it damn near impossible and then nag you to death about the advantages of one of their shiny Microsoft online accounts. Microsoft tried to create the walled garden with RT and it failed so now they are using the slowly bring the water to a boil method of gently getting users used to requiring an account. Since Apple is the king of walled garden systems you can bet they are watching this experiment closely and will soon "invent" it on OS X.
A failure will not appear until a unit has passed final inspection.