Under common law, there is no legal contract without a meeting of minds. There can be no meeting of minds without comprehension. Per studies of reading abilities, only 2% of Americans read at a college level. (See https://www.wyliecomm.com/2019/03/us-literacy-rate/ for a source.) Therefore such contracts should not be legally enforceable on the other 98% of Americans.
This reasoning applies only to contracts where members of the general public were expected to review the contract unassisted. By contrast in a business contract where both sides retained legal counsel, the complexity of the language is not prima facie evidence that the contract was unlikely to be understood.
If we decide that uninformed consent is still consent, we open a significant problem. And if we try to patch it by selectively applying the standard, we introduce arbitrariness which is an even larger problem.