I’m not saying strength is more mediocre than intelligence, I’m saying both abilities have mechanical uses that dumping them impacts, but in the case of strength, those mechanical effects are generally treated as sufficient to represent the low stat, while in the case of intelligence, a lot of DMs insist that players who dump it also meet some arbitrary standard of “roleplaying their intelligence” in addition to its mechanical effects.
Ahem ... I already addressed this in the post-
I would say that most tables I have played at that have been heavy into "role playing" to tend to incorporate the physical abilities into the character conception, and that we have the same divide. In other words, people who aren't taking the physical abilities into account for RPing say, "Look, we don't do this for the physical abilities, so why should we for the mental ones!" While the people who do it for the mental ones say, "Look, we do it for the physical abilities, so of course we do it for the mental ones!"
Two ships passing in the night.
I wrote a long-ish piece on this outlining the issues as I saw them (that you are ignoring) and stating that I didn't want to argue them (so you can accuse me of double-standarding, I guess?).