I love the brand loyalty guys but if the same model of bike kept breaking/snapping/delicately cracking on me I would still start asking myself if I'd bought the wrong bike for the sort of riding I do.
Its not broken its cracked and he keeps an eye on his bike so no issue.
If the head tube suddenly broke off when you knwo you hadn't done anything major then thats would be a good time to move on.
That's like saying it's ok I haven't broken my leg, I've only fractured it and I'm keeping and eye on it so it should be fine 😉
I love my bike to bits – never ridden a better one and was absolutely gutted when I found a crack. Warranty service was fantastic and I had a new bike within a couple of weeks. I was still without my full susser for 2 weeks though and it's still a concern that it's going to happen again.
Just my opinion though obviously 🙂