In their defence (not the defence of the WYSIWYG box itself) - they quite likely have done lots of user testing that has shown clear desirability, improved value to user, improved usability, etc etc. You have to remember Slack's target persona is probably no longer the Engineer (If it ever was) - it's more likely a much less tech-savvy employee who finds WYSIWYG editors very handy to create rich text inputs. I guess…
> they quite likely have done lots of user testing that has shown clear desirability, improved value to user, improved usability I have never worked at a company that did user testing or if they did it was always done in a way or interpreted in a way to back up the designer's opinion. I don't think I've once in my entire 40 yr career seen a designer test with users, find out something was bad, and change their design…
If we didn't do this we'd lose to the competition.
When I worked at EA we regularly performed user validation, we had a whole room set up for proctored user testing. Hired professionals to conduct the testing. We also invested a heap into A/B testing and had a whole team dedicated to tracking this and analytics in general. This was just for marketing/launch web sites.
I've been working in the industry for 20 years and while the norm is as you describe there are certainly plenty of exceptions, especially when you product lives and dies by UX.