have you ever seen the butterfly effect, or rather, know what it is in general? you can’t have that last minute shift without those same shifts happening all throughout the game. that last minute push to win is an occurrence of your team getting enough of those shifts in your favor to push the enemy team back and/or lock them in spawn by getting those picks and giving you enough time to get enough damage for that win.
meltdown is more of a balancing act, you could even make a case that getting a pick is even more important due to it having heavier weight of effect since your team is split. clearing your lane with 1-2 of your opponents in spawn is a daunting state in meltdown because you now have to split 3 people across those 2 lanes where the opponent can afford to almost double team every person you have left and push the weak lane