https://lawsofux.com/
все законы и принципы ux с ссылками на оригиналы. их двадцать один оказывается (был уверен, что не больше трех). но про эстетику первый, конечно:

users often perceive aesthetically pleasing design as design that’s more usable

1. an aesthetically pleasing design creates a positive response in people’s brains and leads them to believe the design actually works better
2. people are more tolerant of minor usability issues when the design of a product or service is aesthetically pleasing
3. visually pleasing design can mask usability problems and prevent issues from being discovered during usability testing