I listed games that had the microtransactions, such as the newer battlefield games, Dead space, even AC black flag to name a few. Do the games seem "more" grindy than the ones before it? Not really. Does it break the game simply because the transactions are there? Not at all.
So your comparison of Game A versus Game B is flawed right from the jump because of practical examples on the market we can point to right now.
Are you kidding? Dead Space alone changed the entire franchise's weapon system to be part-based so that they could monetize it.