> Speaking practically, I don't see a need or reason for this. I can just login to my bank and brokerage accounts and check live data on the spot.
First mentioned and most prominent feature is "Accounts Aggregation" on the landing page. If you don't have multiple accounts, it makes sense you don't see any need for this. But you should also realize that it's fairly common to have multiple accounts, for various of reasons.
I have multiple accounts and I use the friction of logging in manually to each as an incentive not to check them. About every 6 months or more I get a beer, login to each, and check for surprises. Ever since decades ago I gave up my personal autonomy (I will not pick stocks, GE, really?) and channeled my inner boglehead there has not been any surprises.
My main brokerage (Schwab, and I assume most others) have account aggregation built in, so that's become my de facto 'wealth manager' dashboard.
Now, those external accounts are second-class citizens and don't get portfolio analysis and stuff like that, so there is room for improvement, but the ease of use and cost (free) is hard to beat.
First mentioned and most prominent feature is "Accounts Aggregation" on the landing page. If you don't have multiple accounts, it makes sense you don't see any need for this. But you should also realize that it's fairly common to have multiple accounts, for various of reasons.