Here's a "realistic" or "possibly reasonable" explanation to seeing more leads blown late in the game. Two factors, pitcher stamina and confidence. For some reason, relievers stamina seems to drop faster than starters. There are times I throw 12 pitches with a reliever and they are in the yellow already and I haven't even used them for 3+ games. When stamina drops, pitchers tend to leave more "hangers" in this game. Relievers should all be able to throw nearly 20 pitches before their stamina drops into the yellow, and that's only if they're throwing a lot of bad pitches and getting behind in the count. Working ahead in the count should allow their stamina to stay green. The other factor is pitcher confidence and I think this is the bigger one.
Relievers confidence tends to only slightly differ from a starters in the sense of how quickly it builds. When pitchers have normal confidence, they are much more likely to have bad RNG based results in the game. It seems like for a reliever to get high confidence they have to either strike out the first two batters they face and then get ahead, by this point you're down to 1 or 2 strikes and the game is basically over. Relievers, especially those with clutch ratings in the 100+ should start out with enough confidence already that it only requires them to get ahead or get a quick out and they're nearly full.
I think these two factors, coupled with the "hangers" that happen a lot more this year make it so hard to close games out. I don't think the game favors anyone or tries to dictate a winner, simply that the way the game is designed it favors hitters over pitchers coming in out of the pen.