For me, the greatest problem of 5e, is the low lethality. Monsters has way more HP than in previous editions and spells and other things deals way less damage and has way less nasty abilities. For eg, Succubus on 1e had 5% chance of summoning a demon lord, casters had a d4 and the CON mod was rare to obtain while rolling stats. Not to mention that at lv 9, they stop gaining hit dices and gain just +1 hp per level.
5e has the second lowest lethality of TT RPG's, losing only to 4e, where a mere Orc can soak literally dozens of Cannon shots and walk as if is nothing. Meanwhile, 2e has one of the highest lethality, losing only to very simulationist games such as GURPS and some retroclones which tries to be more deadly than old school D&D like Lamentations of the Flame Princess. Where a single summon monster 1 going in the worst way possible can cause a party wipe in a single round.
And Larian, not only picked a game with very low lethality, where CR 2 monsters can soak siege weapons shots but also decided to lower their AC and buff their HP making the combat a tedium. Why not maximize the damage from both parties as a optional mode. "but is less balanced" -> I don't care, I wanna a higher lethality and I hate. Even maximizing the damage on both parties, Even maximizing the damage from both sides, the game still gonna be very low lethality for my taste.