OTOH, not stretching and with a saddle sore keeping me off the bike, I came down with sciatica so bad I was dragging one leg. I fixed that with stretching and walking. No medical intervention was found necessary since I was fixing it myself. I used my standard stretching routine: IT Band pain (during ride)
and then did McKenzie Method stretches: IT Band pain (during ride)
I did this McKenzie series:



In terms of spine rotation, I also used these stretches: https://www.healthline.com/health/ba...atic-stretches
while I had sciatica and they also had a very beneficial effect and sped up the healing process. I don't do them anymore simply because they take time and I feel OK.

It took a month or so, but this routine fixed me right up. I've also had knee tendinitis issues from not stretching. Again, my stretches fixed me right up inside a week.

I think you might revise your point to say "overstretching" rather than stretching. The former is a good point. I once pulled a hamstring overstretching, which took a long time to heal. And it is true that overstretchng can cause sports injuries by allowing the joint to take a big load outside its normal range with bad consequences. That said, the opinions in your link are not generally supported by the medical community, nor by my experience and the experience of my cycling buddies.

IMO, the way one avoids joint and spine injuries is to strengthen the muscles surrounding joints and the spine. This helps hold them in alignment. One key to injury prevention is holding things in alignment. Another key is to keep one's muscles and tendons sufficiently flexible so that normal sports movements do not take them to the limit of said flexibility. It's easy to go over a little in normal activity as well as in crashes, falls, and mistakes. I once had to finish a long cycling route by pedaling one-legged because of a lack of stretching my knee tendons. Luckily I only had a few miles to go.