"its not like you were obliged to pay for the microtransactions"

In 99.9% of the cases to incentivise MTA, the intended gameplay experience is altered to add more boring tedium and grind to make purchasing MTA solutions (like boosters) an appealing offer, that makes the game as enjoyable as it should have been from the very start.

You support buying a solution to the problem that was manufactured by same people who are selling the solution to you.

Even if you argue about "resulting value being same", remember this: these MTA solutions are designed to be purchased repeatedly, and in case of boosters are timed. So you if you are going to play the game for a while, or replay the game at some point, to achieve same experience and lkevel of enjoyment, you'd have to purchase the same boosters again.
In the end you'd be paying more.

If that was not the case, publishers would not have pushed MTAs so heavily, and people would not have argued so much against them.

Every. Fucking. Time.