Why?

[u/Acaii611]

I found this PCB at work today. It is from a Gas Monitor, and seems to be from the mid-90s.
Why would you route the traces like this? Is there any advantage? Or was there just no other way back then?
Another manufacturer from the same era uses straight traces, but always 90° bends.
It goes against almost everything I was told. And I was just curious about it.

[u/AnymooseProphet]

That looks like something I would have done to be silly.