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Which leads to the next point: the justification for client-side JS is invariably "interactivity".

But I can count on one hand the number of teams that have done bake-offs to *measure* if one library or approach will improve interactivity for representative users. Even teams that have tons of data about their userbase *do not do this* today! It's a lost art.

And unless an org is practicing the lost art of bake-offs, *it is not sophisticated enough to bet on JS*.