1. Same problem. There is still no Linux client, for example.
2. It's a different API. Most services specifically require Mobile BankID these days. Desktop (regular) BankID won't work there.
3. Many applications are only useful on the go, such as Swish.
> Access delegation not being part of BankID itself is a feature not a deficiency, it would undermine the concept of secure digital ID if someone else could digitally impersonate you with it.
Different kinds of services have different security requirements. If multiple people live together then it makes sense that any of them should be able to send requests to their cleaning service.
There is also already a clear precedent to allow delegation of access that require strong authentication IRL. For example, PostNord allows you to retrieve someone else's mail as long as you provide ID for both yourself and the recipient. You can issue a Fullmakt which authorizes someone to take legally binding actions on your behalf. Hell, you can even vote by delegate.[0]
Why should those rights not extend into the digital world?
> Instead, services can choose whether they let you allow someone to log in for you.
And they don't, because they are lazy and think BankID has magically solved all of their authentication woes.
[0]: https://www.val.se/servicelankar/teckensprak/satt-att-rosta....