Hardware wallets are mostly good for those people who are looking for convenience and want to have a good security because they either can't or don't have the time to learn how to do things on their own. Otherwise I don't think there is any threshold for how much bitcoin you own before you buy one of these hardware wallets.
Would not make sense to purchase a device of $60 - $200 price range if storing only a couple bucks on it. Just my 2c and my personal opinion but I do understand where you both come from. Price fluctuates and not everyone has a lot of time on their hands. Fair enough.
I agree with HCP. It comes down to the individual's own view over the situation. If I had the opportunity to start with crypto from zero again, I would go with an open source mobile or desktop wallet because they taught me so much more than Hardware Wallets did. To me, convenience is not worth it when you are sacrificing important steps. From my point of view, only by owning enough experience and knowledge you can succeed with cryptocurrencies.
Despite the above, there are definitely many more ways to mess up your portfolio by using Software Wallets than Hardware Wallets. Depends on what the user is looking more for: convenience or education?
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Regards,
PrivacyG