Also, additional artificial self-restrictions on top of the non-restricting rules are disastrous for balance. In the current iteration, whether you are building an optimal or a sub-optimal build, you are all still operating within the universal set of restrictions and the power curve between the player1's unoptimized build and player2's perfectly optimized build would not be very different. When you unlock everything for everyone and abolish the rules, the powercurve will dramatically shift towards the hyper optimized builds. This will ruin both fun and balance for parties where players want different experience and have different priorities in terms of their characters.
Multiclassing only goes so far and has its own host of balance problems to consider.
We're all still operating under the same universal ruleset. The rulset is just different. The powercurve is also pretty much the same, the main difference is that now everyone has the choice to be on the SAME power curve rather than some characters being forced to be a step behind the rest of the party for 99% of the game because they chose the wrong kind of character to play.
Also, I find it interesting you'd prefer a world where I don't have a choice to play a Dragonborn Druid with 16 in WIS over a system where you still have a choice to play a Dragonborn with 15 in WIS.
If you want to play an unoptimized character the choice to do so is still there for you, it's just not enforced on me against my will.
