It develops all your peices. What else do you want?
Why is Ruy Lopez even a thing?
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... You also have to spend another move coming back, and often yet another one, to move one piece 3 times (which seems to be against opening best practice), for an attack that if implemented doesn't work...
You talk as if ... a6 and ... b5 were useful moves for Black.
In fact, those moves just create Pawn weakness and targets on Black's Queen's side. It isn't a loss of time for White if Black is using that time to weaken and expose his Pawns instead of developing pieces and pressuring important squares.
Also, the White Bishop is being kicked back to a better square (the b3 square) from which it can pressure both the center and Black's f7 square. The b3 square is an even better spot than c4, since it has all the advantages of the c4 square but is also guarded (while the Bishop on c4 is not) and is immune to attack by a Black d7-d5 move.
Are you sure that Black's ... a6 and ... b5 move are advantageous?