Not that simple. Example: east of Lauwersoog (north shore of the Netherlands) there's a dyke reinforcement project underway. Roughly 2/3 of the dyke's seaside is covered with regular rows of interlocking concrete blocks (~25 x 25 cm top view). At the base of the dyke, there's stone rubble to dissipate wave energy. These are heavy stones: 100s of kg each on average. But loose - some even wobble if you step on them! There's probably some other things in there like layer(s) of geotextile & such.

I'm pretty sure if those rubble stones weren't there, waves would 'eat' some rows of the smaller blocks, wash away a few metres of sand, then rows above would collapse, expose more sand, etc.

So it's not like those stones aren't doing anything.

In other places on the Dutch coast, it's more common to pump sand onto the beach every X year to replace what the sea eroded. 'Must read' in this context:

https://en.wikipedia.org/wiki/Sand_engine

TLDR; wave patterns, coastlines & what's behind them are different. So are strategies to protect them.