I wish I had known/understood this back in 2021. I feel like the marketing/eduction around II vs hardware wallets wasn’t really present, or at least I missed it. Seems to me that most of the lay people in the community believe (believed?) II to be extremely secure. It’s only after digging in that we discover these flaws.
So a concrete suggestion is to fix the education/marketing of II, or increase its security. How many people have locked up a lot of ICP on the NNS using II? Probably a lot of people. And the unfortunate thing is that there is currently no way to change that choice AFAIK.