Counterspelled Booming Blade

[Keltest]

Incorrect. Making a melee weapon attack takes an action: the Attack Action.

That is the general rule
It is only by exception (two weapon fighting rule for example, Specific over general) that making a melee weapon attack is handled by another rule.

As to: Steel Wind Strike. That is a 5th Level spell, and not appropriate for a discussion about a cantrip.

The Attack action is one action that allows you to make a melee weapon attack. It is not the only action to do so, and it isn't a case of specific trumping general to allow another action to also do so, because there is no rule that says the Attack action is the only way to make a melee weapon attack.