It’s probably hard to change the UI of an existing brokerage service though. Tons of testing required given the potential size of the transactions involved.
have you seen vanguard lately? they randomly switch you between an old and new ui. its pretty bad
That’s called AB testing, baby
Vanguard UI is so bad for actively trading or even checking your positions that at this point I can only think its somehow part of their brand where they think they would actually lose customers if they updated it.