[SFjulie1]

This topic is often discussed on nanog

The answers is the same as in software industry: Configuration management.

Plus it makes then harder to develop corporate cultures of deploying well known patterns that makes routers best used.

Plus it increases the surface of vulnerability for government backdoors.

In real life, there is a trend for going BSD box for cost/formation/stability/security reasons in the ISP world ... especially in non US countries that are getting kind of thinking the USA is becoming the new USSR in terms of systematic spying on every one.

These Europeans really don't get it, isn't it? They never were in the middle of cold war spying insanity where both power would puppet so called terrorists groups to make sure citizen would vote the right way under the fear.

What a bunch of stupid persons not believing that business companies are incorruptible and think they have incentive to betray them in exchange for gvt subsidies/regulations.