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I think y'all are taking a very clever approach by integrating with Jira. Although Jira is not a great experience, it is so sticky. Switching to something else should just be too much of a headache so people just deal with the ongoing, minor headache of Jira itself.
By integrating with Jira, you can greatly reduce the switching costs.
For what it's worth, one reason people get locked into Jira is that all of their previous tickets are there. That historical context can sometimes be super useful. So if your ultimate goal is enable people to switch of Jira entirely, I would recommend looking into whether people want to bring their full Jira history with them.
I'm a Jira user, but you really struck the chord with the performance comparison. ("sub 50ms interactions" is 🥵🥵🥵)
Jira UI loading time is usually the time for a little reflection, maybe a sip of coffee. Sometimes I manage to squeeze in a little stretch, other time I go shopping or pilates.
Looks like that now I will have to leave those things to after work hours :)