Hey there! Glad you enjoyed the talk! Also, excellent question.
So design has a huge overlap with trust. Imagine walking into a physical store that was messy, cluttered, uncomfortable, or made you feel unsafe in some way – you'd probably leave and not come back, right? Websites are the same way.
When we're building an app or website, we're almost always asking a user to trust us with something – that could be personal data (account information, email address, personal information, etc), financial data (credit card numbers, bank routing numbers), etc.
If you've ever accidentally opened a phishing or scam email before, you've seen design that doesn't look trustworthy. Things just look "off" – unprofessional, careless, inconsistent, etc. Those things have become visual red flags to us. Users have come to expect a certain amount of professionalism and polish in a site/app, and if we don't deliver it...we run the risk of not feeling trustworthy.
The consequences to this usually start with reduced interaction (not feeling comfortable inputting information) and end with simply not using the app or website at all.
Let me know if this answers your question!
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