That solves one issue, the other being how buggy it can be to use in the browser. The file signing feature is separate software (which has an official Linux port!), but to log into your bank, etc, browsers often pre-decide for you which certificate you want to use and then complain that it's not present. Perhaps it's changed now, I haven't used it much in quite a few years now because Mobiil-ID and Smart-ID have just worked 99% of time.