I think it’s because of the statement “you can only copy what you understand”. I get the sentiment, but comes off as paternal rather than collaborative.
We had a course on it as part of my degree, I believe it was required for the course to be accredited by the BCS (British Computer Society), but I could be wrong on - this was over 25 years ago.
BGI was basically a subsidiary and run independently. It was originally part of Wells Fargo (hence the SF HQ) - just pointing out that although it had the Barclays name, it was separate.
Will people bother to migrate though? I think they might just stick with what they have and if they do need to upgrade frameworks they may very well steer away from angular altogether.