For me, DS Flash quality is still insufficient for bigger / more complex tasks. DS has gotten better by a lot, but I prefer Opus 5.5 because it gets things right with much fewer tokens. DS also sometimes gets stuck in a thinking loop "hmm... hmmm... hmmmm hmm hmmmm..." which is hilarious when you check on it after 30 minutes
Totally makes sense, for me it was just that I observed its doing good work so that I never really need anything stronger.
btw. I'm not reviewing code in detail anymore. I only give direction and provide architecture design vision, its the model and couple of async agents working in the background and consuming work resulting in PRs which I manually approve after an eye-glance.