It isn't the set of features that makes them sticky. It is the 10% of features the lead PM can't live without, and the slightly-overlapping-but-different 10% of features the team PM's can't live without, and the slightly-overlapping-but-different 10% of features the developers can't live without, and the roll-up report features the leadership team can't live without... There has been some research into this phenomena [1]. I'm not aware of a handy term for the phenomena, would surely appreciate someone pointing me to it, and the industry recognizing it and building for it, though.
Internally in my head I call it "multiplexing feature sets". Though I never say that aloud and just give the long-winded explanation if I have to bring it up in meetings.
> ...I don't see any reason why we should prefer Atlassian over Taiga, other than familiarity and inertia.
In large-organization dynamics, never underestimate the familiarity and inertia factors. I regularly see vendors screw this up so badly. Account management teams of even large organization vendors (so they should be taking action upon this, but apparently are not) regularly have no clue what kind of massive red flag it takes to push their decade(s)-entrenched product from "man we wish this could be better" to "you really need to fix this, or we need to start looking elsewhere".
How do you tell when a customer is just kvetching and presenting empty threats, or is laying it on the line to you? Easy: the customer is happy to share with you specific details of how the product shortcomings/defects are impacting line of business processes and the business impact (ask for this under the cover of learning what the critical business impact is so your support teams can devise the most appropriate tactical technical solution for immediate partial/total relief), and is eager for live working sessions with the customer's engineers.
And understand this: rarely will a customer reveal they have switched away until it is practically finished. They want to maintain what little interim support quality they have left, until they can step off. If your account management practices engage "all hands on deck" priority support when you get wind of a competitor in the wheelhouse, then you've lost before you even started. That's why the reveal is always a shock to vendors, and always a done deal when it is shared.
The time to understand that your product and product support consumption experience for a particular set of customer needs is horribly broken is when you notice a customer requesting product support leadership engagement more than 2-3 times in a year. If you aren't tracking those engagement touch points, then I guarantee you are losing license sales. They just don't show up in the sales metrics.
[1] https://www.sciencedirect.com/science/article/pii/S187770581...