Unfortunately true. Ironically the Legislative Branch could take back its authority any time it wishes IF professional life time and corrupt to the bone politicians were consistently willing to risk everything fighting the Executive Branch (regardless of which Party's president holds it) to a standstill no matter what. But of course not enough from either party are ever willing to do that, and so they have pretty much politically neutered themselves.
The thing about congress is that the party who holds the white house, their congressional members become part of the administration instead of congress. They are more than willing to cede all congressional power to the presidency because the president is of the same party they are. Pride in the institution of congress, pride in it being a co-equal branch and providing checks and balances on the administration is thrown into the trash. That is until the other party wins the white house and then congressional parties switch roles.
Congress now has become irrelevant in most things.