Lyxen
Great Old One
I mean, is it a great sign for an RPG system that there's so much handwringing in 5e over balanced encounters? This is not a thing in every RPG, or, I'd argue, most of them! These aren't boxing matches. You don't need to weigh all the participants and make sure both sides are perfectly, evenly matched. If the PCs are outmatched, they can run away, like countless protagonists do in countless movies, books, etc. If a fight is easy, well, is the fight really the most interesting part of the story, anyway, or is it some narrative consequence or result from the fight?
For me, this is a drift that started in 3e and was pushed to so much of an extreme in 4e that it led to a "closed" system, because - it's not a coincidence - it happened in parallel with MMORPGs where the environment is fixed which allows balance to be way more controlled (and still people complain that some builds are superiors to others in some environments, etc.). I'm not saying that 3e/4e were MMORPG, but their design was influenced by them.
Thankfully, the 5e designers have realised that balance is completely artificial anway for any combination and that, because it's fully collaborative anyway, it does not matter as much as in games where PvP is so present. And so they reinstated the DM as the supreme authority, which solves all problems at any table assuming that the whole table agrees about this overarching principle
For example, imagine paging through a Call of Cthulhu adventure, and stressing about whether three players make for a balanced encounter against a Shoggoth, while four might walk all over it. Or even in something as combat-heavy and power fantasy-based as 5e, like Shadowrun, does anyone seriously fret about balance like this? I've never seen it myself, and it always makes me feel real weird about this hobby, that a problem so boring and self-inflicted would be such a recurring one.
That's always the problem with creations trying to be multiple things at the same time, the compromise causes these self-inflicted wounds... And while CoC is 100% in the TTRPG sphere, D&D is not (which is not a criticism of other ways to play, but it would be naive to deny it either).