It's not a huge change though. .dev was a new, never-launched TLD, so there were no existing real domain names to break with the addition of HSTS preloading. Established best practice for decades at that point was already to always use real domain names (or subdomains thereof) or specifically reserved test domains/TLDs (see RFC 2606, published in 1999) for testing/development/local networking purposes.
So yes, we didn't anticipate how many people weren't following the best practices, but that would have been hard to determine prior to doing the thing anyway. There were also lots of people who had the mindset of "We won't change anything until it stops working", so in some sense a lot of it was unavoidable. See e.g.: https://github.com/laravel/valet/issues/204https://github.com/laravel/valet/issues/294https://github.com/laravel/valet/issues/431 (note that Laravel users were responsible for a non-trivial fraction of the total problems experienced, and that we only discovered all this post-HSTS-preloading). The problem was repeatedly pointed out and the maintainers refused to fix it until it actually broke. So, inevitably, it broke, and then they fixed it.
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This really makes me consider moving my family to Zurich.
Looking back at growing up in Germany/Europe made me really feel disadvantaged compared to people growing up in more tech friendly environments. I would want my child to grow up somewhere where technology is not overwhelmingly debated about in a negative light.
So much good stuff is coming out of ETH that it really seems to be a place where people talk more enthusiastically about tech in general.
So yes, we didn't anticipate how many people weren't following the best practices, but that would have been hard to determine prior to doing the thing anyway. There were also lots of people who had the mindset of "We won't change anything until it stops working", so in some sense a lot of it was unavoidable. See e.g.: https://github.com/laravel/valet/issues/204 https://github.com/laravel/valet/issues/294 https://github.com/laravel/valet/issues/431 (note that Laravel users were responsible for a non-trivial fraction of the total problems experienced, and that we only discovered all this post-HSTS-preloading). The problem was repeatedly pointed out and the maintainers refused to fix it until it actually broke. So, inevitably, it broke, and then they fixed it.