These backdoors in the news lately - Juniper and now Fortigate - are scary, but thinking back on 10 years in IT I've never operated in a network where SSH on network equipment was accessible to anyone without intranet access through either physical location or VPN.
On top of that I am now in an organization where we're starting to implement security levels on networks, anything above level 0 requires 2FA to access and you can never connect a lower level to a higher level. So best practices are a good thing.