Form validation is still incredibly time consuming for developers. Just today while working with 3.1, I've had http request road-blocks because DateField::setConfig() isn't behaving, and even changing from DateField -> TextField are still throwing DateField validation errors erroneously.
I feel form validation should be an additive model, developers should be able to understand what they're adding to their forms, not battling with bloat that doesn't even behave when following the API documentation to the letter. Even if the preliminary From and FormField structure is for the CMS, then I feel it should be abstracted more effectively.
What can be done about this?