No. That's not what's happening, here.I didn’t say it did, I said it’s completely optional.
So, from my perspective, you’ve exactly reversed what is happening, here.
It’s supposed to “barely be there”. That’s the point. It isn’t weak if it’s doing what it was built to do, which is provide only the rules needed to resolve actions/tasks, and otherwise get out of the way. Because the preference of enough playtest players was exactly that, we wanted very concrete combat rules because balance matters more in combat, and very loose rules with as much room as possible for interpretation for social scenes.
I've made a statement, that D&D has only a vestigial quantity of Exploration Pillar and Social Pillar mechanics, compared to other games which have significantly more. This statement is a statement of fact. Many of the "Bespoke TTRPGs" that are referenced in this thread, and in the threads/posts you complain about have a significantly more comprehensive structure for those pillars of play. This is not a debatable fact.
You have decided to instead debate on subjectivity, that D&D has "All that is Needed".
You're now trying to explain -why- it's more important and "Better" to have a less robust setup for those two aspects of gameplay which is really not the purpose of my pointing it out.
It feels like you're trying to "Defend" D&D from this statement of fact. That other systems having more focus on different aspects would make it "Less Than" them, unless you were to explain that it is at least equal, or superior, for having so little focus on those systems. Rather than just -different-.
And I am super confused as to -why-.
That you prefer D&D's "Rules Light" method, or that the playtesters for 4e and 5e preferred it, has no impact on the fact that other games have more robust systems.
I think the problem is that you've taken "Weak" or "Vestigial" as a value judgement rather than a statement of relative fullness.