Having a long uptime is fine if you run a system not on the Internet.
If you are on the Internet, then a long uptime is like being proud of not having read
a newspaper for that many days.
Uptime used to be significant over a decade ago, when some systems were recommended to reboot periodically. Windows NT 4 had a bug where it would
crash after 49.7 days uptime. It was a common practise to reboot it once
a month, and people lived with that until MS eventually noticed their uptime
counter problem and patched it.
Today, there are no OSs with a problem like it. Maybe memory leaks
in winbind or something, but the OS itself these days is robust.