I think the discussion part is irrespective of the chosen stack.
Not that my experience is larger than a pebble, it does appear that people stand clear of learning something in the midst of needing to also solve problems.
what you describe quite often defaults to "select what I know" rather than "select what I would like to learn", because the time constraints. When you don't really have the time to learn, introduce and develop some feature basing on a new solution, you go with the one you know to meet the requirements.
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