> But their ability to handle the long tail of accounts is the biggest reason it’s often not considered.
According to a few google searches, this is simply not true:
Yodlee supports 14k banks and Plaid supports 11k banks
I personally have used Kubera as a consumer who use both Plaid and Yodlee to connect to banks. I have ~3 bank accounts (that represent great candidates for long tail) that simply do not work with EITHER service provider. Having spoken to the support staff from Kubera (who are great btw) they prefer to use Plaid for some of the reasons you mention, but not because its all encompassing.
Categorizing Yodlee as "they barely touch plaid" is simply disingenuous. Much of the functionality is comparable, it's just MUCH better on Plaid for both the developer and the consumer in terms of overall experience.