"Bite the Bullet" is a phrase from an Englishman, Rudyard Kipling, in his first novel, "The Light That Failed". It's believed to have come from the other English idioms, "to bite the cartridge" and "chew a bullet", which date back to 1891 and at least 1796. [1]
Not an idiom I'm familiar with, but it's grammatically correct and clear so I'd count it as proper.
"Bite the bullet" is commonly used.
Atlassian completely ignored the large number of smaller customers who are legally forced to use an on-premise solution. If the software industry was so hell-bent on SaaS there would be a great business oppotunity in creating an on-premise Jira competitor.
And it is the exact same software as Server with some extras enabled like support for multiple nodes, so upgrading to it is as simple as pasting in a new product key.
You’ve never actually had to update an on-premise JIRA instance yourself, I presume?