Even if you have expertise in cybersecurity, hackers can get what they want especially if it's a group. That's why it's one of the disadvantages once crypto was adapted to be the main currency or use it as a huge business. One of the results also, people will give negative thoughts about crypto regarding this situation.
I think that cryptocurrency should be never adopted as the main currency of a country over paper notes. Though that sounds a bit outdated, but think about a whole country getting robbed by only a single exploit and by a single person- that won't be an ideal situation to fall in. So, my personal opinion is, use cryptocurrency as an alternative to paper notes, not as a replacement.
Lots or almost majority do really hope for that global adoption thing on where crypto would completely replace fiats? Even in our dreams these things wont really happen due to lots of factors
that would block out such possibility and also it isnt really capable on every aspect.People would still prefer fiat in any case in the end of the day.
On topic about a crypto whale got victimized by sim hack then its just pretty dumb for someone on using up his own phone or some web wallet platforms on storing
up those millions.Even storing it on an offline wallet does still have the risk on losing those coins, how much more to those storage which are actively being used online?