You are correct! I'm a programmer at Yahoo -- deploying multiple times a day to production, with the confidence your code will work, feels great.
Manual ("batch-release") deployments have been forbidden for over a year, which is a forcing function to change development process to allow deploying to production continuously multiple times a day. This requires robust test and deployment automation and for engineers to better understand what they build. It's pretty nice overall!
Forgive the throwaway -- but how does Yahoo define "will work?" Ignoring the calls against the UX change of several years ago, your own user feedback pages at https://yahoo.uservoice.com/forums/207809 make it pretty clear that longstanding issues such as spam (the same ring of spammers has operated for multiple years as Ultimate Stock Alerts, PennyStockAlerts and ExplosiveOTC and others -- simple Bayesian filtering could have solved this years ago) and things like the fact that the ignore function (a pretty core piece of functionality) has never actually ignored users - merely greyed them out, but they still take up space on the screen.
My point isn't to be negative about the state of Yahoo Finance; you probably don't work in that department, and after three years of neglect, most of the users are long gone.
My point is that if an organization is going to rely on end users to report bugs, the organization must actually respond to those bugs. Sometimes the answer might be "No, we're not going back to the Web 1.0 UX." But ignoring the top bugs for multiple years suggests a breakdown in the feedback mechanism. If Yahoo doesn't care, that's fine, it's just business. But it seems more likely that Yahoo doesn't even know there's a problem, because there's no way for user feedback to make it to the developers.
Manual ("batch-release") deployments have been forbidden for over a year, which is a forcing function to change development process to allow deploying to production continuously multiple times a day. This requires robust test and deployment automation and for engineers to better understand what they build. It's pretty nice overall!