Our experience is different. We are using Jira cloud for more than 5 years and I don't even remember the last time an outage has affected our work.
Meanwhile we still have some self-hosted services (like SVN) which has problems relatively frequently which require manual attention from engineer's time. I probably spent more than a week maintaining our self hosted services last year, compared to 0 minutes for the cloud services we use. Not even including that our self-hosted services are probably not very secure since we sometimes forget to do updates on our servers for a long time.
I can't talk for the parent, but in our company, we've made the change hg -> git (using self-hosted bitbucket) and it was quite a costly endeavor time-wise (between testing, configuring and installing BB, converting/moving all the repos, making the changes to our in-house build system, changing all our code signing system (because it wasn't git-compatible) and supporting all the devs who've never used git (or haven't in a long time and forgot everything)), so I can understand not wanting to change what's working.
We use git for all software projects, SVN for all hardware projects. I am not certain about the reasons why hardware department still uses SVN. Probably because every hardware engineer is familiar with SVN and it works for them.
The irony is they don't let you host your own system anymore unless you run 500+ accounts. We don't want to and can't switch to a hosted solution so we are still trying to figure out what we are going to do when our licenses expire.
Meanwhile we still have some self-hosted services (like SVN) which has problems relatively frequently which require manual attention from engineer's time. I probably spent more than a week maintaining our self hosted services last year, compared to 0 minutes for the cloud services we use. Not even including that our self-hosted services are probably not very secure since we sometimes forget to do updates on our servers for a long time.