I've been frequently fascinated by is loading screen UX. How we choose to present loading can have a huge impact on how a customer views a product. For example,

I've been frequently fascinated by is loading screen UX. How we choose to present loading can have a huge impact on how a customer views a product. For example, if you have a bespoke loading icon, users will tend to think the issue with with your product and not the underlying system. If you use a default system loading icon, they'll blame their phone/OS/wifi. These days, cutting edge loading UX means placeholders: https://uxdesign.cc/stop-using-a-loading-spinner-theres-something-better-d186194f771e https://uxdesign.cc/stop-using-a-loading-spinner-theres-some...