Crackpot Decision Theories popular around here do not solve any real problem arising from laws of causality operating normally, so there's no point studying them seriously.

Yeah, assuming an universe where causality only goes forward in time and where your decision processes are completely hidden from outside, CDT works; but humans are not perfect liars, so they leak out information about the decision they're about to make before they start to consciously act upon it, so the assumptions of CDT are only approximately true, and in some cases TDT may return better results.