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Not always, although it's preferable where it makes sense. Something like httpie is much better than curl and wget and it's definitely worth learning its interface. If they tried to make it drop-in, a lot of the benefits eould be lost.

Not necessarily. Newbies enter the field all the time, without the entrenched reflexes. Seasoned Vi users cannot imagine their shortcuts changing, but I cannot imagine getting used to them.

I noticed it at least doesn't mirror `ls -A` because it hides those out of the box. But instead of swallowing -A it throws exit 1