Even before being broken, the abstruse mathematics is one of the reasons to not go with SIKE or Rainbow. It’s not surprising they are broken.
NTRU is the easiest of the NIST PQC finalists to understand, and will probably beat Kyber because even a relatively new-to-cryptography programmer will be able to understand it and implement it.
You can see why people love it, though; the nuts and bolts of SIDH are extremely elegant. Like, it's a neat trick. I don't understand Richelot isogenies and abelian surfaces and can't speak to the elegance of the break; it's the break that exceeds the threshold for "abstruse" (of course, the abstruse mathematics of things that break cryptosystems do make the underlying cryptosystem abstruse! you have to grok them to use it!)
