You keep asserting that this is a good thing, but I disagree; this is clearly a matter of taste. I think the option to not take a penalty should be wrapped up in the option to not play the race in question.
Min-maxing, in D&D terms, refers to (for instance) putting your +1 in an odd stat and your -1 in an odd stat as well, so you gain a higher overall bonus rather than the +1/-1 maintaining a meaningful balance. You are using the term in an entirely different way, which is fine, but I think you will find it makes clear communication difficult. Min-maxing (in the sense most rpgers use the term) doesn't encourage teamwork; it allows a character to work the system for extra bonuses. It's like when you play a really low-strength druid in 3e; who cares what your strength is?? When you need a strength score, you're a bear!
I agree the Human Race is the adaptable and ‘optimizable’ race. The Human is an important, even miraculous magical Race.
Yet I disagree the game must force players to avoid Nonhuman races. For example, I care about mythological accuracy. When I play an Elf, my character concept is a mythologically accurate one - where Charisma and Intelligence are the most salient tropes. The Elf (Alfr) personifies success, superhuman beauty, innate magic, charm, persuasiveness, luck, prestige, fertility, wealth - success in every way. Charisma is essential. Intelligence in the sense of skill, logic, technology, memorization, and so forth is also vital. Also Wisdom is important in the sense of intuition and foresight. On the other hand, Dexterity is irrelevant. The point is, I should be able to play an archetype that I find fun and interesting. The game needs to be as flexible as possible. It shouldnt force me to play a Human in order to explore an Elf archetype.
The +1 +1 −1 approach helps because it can accommodate the needs of two different kinds of play styles. It helps players who play 3e Pathfinder, which uses the +2 +2 −2 model, where the weak ability is seriously deficient and prohibits certain kinds of character concepts. It also helps the players of 4e and - so far - 5e that has no penalty at all, so as to allow players as many character concepts as possible, while still offering a structured game with ‘types’ to play or play against.
Your post refers to ‘the matter of taste’. From your other posts, I am confident I would enjoy playing D&D at the same table with you. At the same time, ‘taste’ is important. D&D is notorious for how diverse its player base is. Creating rules that can accommodate players of different tastes at the same time is vital.