I don't mean to blame anyone here, it is like you say: just human nature. The same is true about initial assumptions and software ecosystems btw, change has bee

I don't mean to blame anyone here, it is like you say: just human nature. The same is true about initial assumptions and software ecosystems btw, change has been their nature since basically forever and calling that a "root cause" seems like being angry at a thistle for having thorns. The world/human society has never been static, why should software be an exception to this? In any case it does not really matter; either Utoronto will eventually rewrite their firewall configs, or they won't and then they will not be able to use HTTP3. These issues have a way of eventually becoming urgent enough to fix and at that time the incentives will sort themselves out.