Booming Blade being reprinted and nerfed in Tasha's [New Preview Release]

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Yep.

Without feats, A level 17 bladesinger can manage 5d8 + 20 in melee (ignoring BB and GFB riders).

A level 17 EK can manage pretty much the same with war magic (though, without two stat mods) at the cost of a bonus action (as can some bards), or something like 6d6+15 without.

The bladesinger has a tasty pile of spells for everything else; as well as access to stuff like foresight.

Feats help, but this becomes more of a case of feats being required for the EK to readily distinguish themselves at what is pretty much their main (if not only) niche than a case of “OMG gwm is so strong!”.