Local storage can be useful in some scenarios as long as one is aware of the security situation and other limitations.
I used local storage on a single page application where the user had the option to play around with various scenarios in a parts configuration/selection quote before committing it to the server/database. There wasn't anything that needed to be secured in there, just the user's sandbox so that they could reuse it as a template for another customer quote or finish their work on the quote the next day.
One big limitation on using IndexedDB and Cache API in the average corporate environment is that many users are still on IE or Edge which don't fully support them.
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Local storage can be useful in some scenarios as long as one is aware of the security situation and other limitations.
I used local storage on a single page application where the user had the option to play around with various scenarios in a parts configuration/selection quote before committing it to the server/database. There wasn't anything that needed to be secured in there, just the user's sandbox so that they could reuse it as a template for another customer quote or finish their work on the quote the next day.
One big limitation on using IndexedDB and Cache API in the average corporate environment is that many users are still on IE or Edge which don't fully support them.