Always wild to find a completely broken UX in core user journeys for huge tech products. 

Recent example was having a credit card expire linked to Spotify. Received a single warning email before account was abruptly canceled; this then removed access to all family plan members. In the 2-3 days before and after, there was zero email marketing to warn or win me back. When I fixed the card, I needed to re-add every account member from scratch, so just downgraded the plan. 

Fixing this flow alone would likely save hundreds of thousands or millions of accounts annually from churning.