That's a lame typical anti-intellectual argument. You might as well as say all of physics is worthless because nobody truly understands gravity.

Notice I didn't use vague terms like "think" or "reason" and instead used specific terms like "feature/circuit internal representation". You're trying to make a false equivalence of "the hard problem of gravity/reasoning/etc is not solved ... so therefore nobody understands anything" and that's obviously a false leap of logic if you've talked to any physicist or ML researcher or whatever.

That type of response is more typical GED holder who wants to feel intellectually superior so they pull out a "well you don't know anything either" to a scientist.