It's not a "fear of change" (which is a ridiculous thing in the first place...) or a "fear that [our] knowledge becomes useless" ('cause if that were the issue we wouldn't be in the IT field). It's just that some of us don't like changes when they bring no benefits that matter to us yet require us to re-learn a bunch of stuff that just generally worked "well enough" for a couple decades.
Yes, it's not a huge deal, but it's still a pain, especially when the previous implementation was satisfactory.
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