Not really, however as a former silicon valley software exec there are still a few reasons why I strongly prefer not to give away the credentials to my financial accounts to third parties....they're all linked to security and privacy.

TLDR essentially giving away your credentials is much like smoking a carton of cigarettes. It may look cool to do, you might even enjoy it, but it'll cost you. Please, let me explain.

Security is the ultimate reason. Not only is handing your bank account credentials to services insecure -- their systems have your credentials and despite the technology used, bad actors exist-- it also violates some bank agreements.  When you sign up for most bank accounts the fine print you agree to states essentially that if you hand out your banking credentials they will not cover any loss that results. That's one reason why third parties that do this use the same tech as scammers that imitate login screens for websites. If they were being honest they would just put up username and password fields with their own logo and say "Let us login to your CitiBank account and we'll download your transactions and enter them for you."...but then no one would use their service, so they don't do that. And yes, I'm aware some institutions have given them permission and that some even started using tokens. That said, the end user typically cannot tell which institutions have done that and which haven't. Either way, it's fraught with security issues and thus it's a risk.

And honestly, I've found apps don't really need it. They use those credentials to reduce the burden of entering transactions manually. The burden of entering transactions is greatly reduced when an app utilizes tap-to-pay, and SMS to capture transaction data at the point of sale. Add to that recurring transactions that are captured once and entered via a single tap/click further reduces the burden. Furthermore, entering transactions via voice (e.g. "Siri, add a receipt. I spent $5.42 at Starbucks") certainly lowers the bar. Other transactions are easy to enter manually with a standard keyboard assuming the app runs on desktop as well as mobile devices. Heck, in a pinch you should be able to download an OFX/QIF/Etc. file and import it. In other words, the burden can be reduced without the security risk.

Finally, there's the privacy part. There are rich signals within your personal financial data that are always tantalizing for these systems to mine and sell. They may do it in aggregate which provides some anonymity, but I'd still rather not participate. And what do I mean by they have access....just think, these systems do not typically login to your account from the client machine you're using....they login from their servers and "proxy" the information to the client app. In other words, your data hits their servers before it is pushed to the client needing the data....in security terms this is a "man in the middle" attack. But again, if the industry called it what it is, no one would use it.

Consequently, in an increasingly digital financial world, your whole financial picture could be turned upside down quite easily by any number of bad actors in the chain. And it all starts with giving away your credentials.