That would break the way terrain, facing/flanking, and the Advantage-Disadvantage mechanic work together in the game. Why should a phase spider on a web higher than the player party lose that height advantage on subsequent dice rolls, just to make it easier for the player to hit it? It's up there for a reason.
It's rumored there will be different difficulty settings, so they'll have to use some way to make it easier or harder. Probably with adjustments to enemy and player HP, or something simple like that. I suppose they could add modifiers to artificially narrow the gap between the two dice rolls on Advantage-Disadvantage checks, but again that would mess more with the basic game design.
I understand what you mean but in my case missing is not a problem for my characters only, the AI keeps missing a lot too! So it is not something that could be solved with difficulty settings, I just think it is unrealistic when no one hits no one for a whole round. It happened to me during the mission search the cellar that I kept missing and the AI too so the battle became too long and boring.
I don't know you guys but I think in D&D missing can be entertaining when the DM makes up an original or funny description for every miss, but that doesn't apply to a video game where all you get is a text that says MISS, so in my opinion missing chances should be lowered for BOTH teams.