Not only is availability a problem, but centering is also another massive hurdle
Likewise, it could be that they have a spell/trap set in their spell/trap zone, so you can place a spell/trap in that same column on your side of the field, and now theres 2 cards in that column, letting you special summon a Mekk-Knight to it On top of being able to get out strong monsters this way multiple times per turn, they have multiple effects, some of which let you move the cards on the field so that you can summon to the same zone (because the columns had 2 or more cards in them) multiple times by letting you move the card you just summoned out of the way and put a new one there
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This asymmetrical effect creates massive tempo swings that will often choose the winner of games, especially when cast during opponents end steps
strategy can replicate that, just with a tad better chance of OTKing the opponent and more widespread disruptive capabilities