Since it's been almost a decade, I figure I can tell this story: I was on the Calendar team at that time, and some project managers enlisted me to do some data

Since it's been almost a decade, I figure I can tell this story: I was on the Calendar team at that time, and some project managers enlisted me to do some data analysis to determine if Tasks should be shut down in favor of reminders. At this time, there was no mobile app for Tasks - the only official mobile site was the basic HTML version for pre-iPhone smartphones. There were, however, several third-party mobile apps using the Tasks API. I was able to demonstrate that those apps, plus the official desktop client (inside Gmail), were responsible for a lot of monthly active users. So I guess Google has finally deduplicated by shutting down Reminders instead, which I think was the right decision. It was probably around 5 years ago or so that Google released an official Tasks mobile app.