Not everyone is a classic GTAM baller 100% of the time with only top shelf cuts that just need "salt and pepper".... only top shelf beer, only top shelf whatever. Won't touch it otherwise.... purist.
Cheap or otherwise disappointing cuts will benefit from marinating (technically not tenerizing but lets call it tenderizing like). Maybe your SO comes home from the grocery store with thin crappy cuts that were on sale, maybe budget is a factor, who knows. It has its place and there are places where it is the wrong way to go. A caution though, anything acidic will make the steak mushy if left for too long.
But lets be fair, if you just want to taste the meat, don't put anything on it. Salt and pepper, steak spices, whatever, adds flavour, maybe subtle depending on how much is put on but it adds flavours.