[Too]

If i download a new version of foo and rename my old version to foo_old_backup_2, should foo_old_backup_2 start behaving differently, just because it has a different name? NO THANKS!

A program should be sandboxed from its environment, including how the user started it. How a user names and organizes his files is a matter between the user and the operating system, not something individual program should care about.

[account42]

A lot of programs actually do need support files at specific locations (either full paths or relative to the executable) so you already don't get to abitrarily organize your program binaries any way you want (without adjusting the programs).