If Expo had called Sketch, "Expo Designer" then people would indeed call it "Expo Designer". "Designer" is too generic.
"Sketch" isn't though. in mainstream tech parlance, it's associated with one very popular app and company.
Sketch the design tool is great. We use it.
This is a fairly terrible choice of name. Please change it.
EDIT: "but if it turns out to be a problem, we'll figure something out." It really seems to be that it is currently a problem unless your definition of a problem isn't public reception but instead a C&D.
I'm just imagining describing the Sketch/Sketch workflow to a non-technical manager... ;)
How about calling it "Expo Studio" or "Expo Easel", which have similar connotations?
One thing about the name, however, that for me now rules it out as a recommendation, is that the two words are not articulated by a consonant; the ending vowel of "Expo" blends into the beginning of "Easel".
An unfortunate pairing, at least to my ear, that when spoken quickly sounds like "Expo Weasel" :)
It could also be called Expo Clip. Then can say "clips" to refer to saved scripts.
On your slack comment: I do understand it. Chatting is traditionally seen as not working. I'm thinking IRC times when I was young(er). Mostly social, not so much project related. It is more seen as the coffee break but online. The fact that both are often used to discuss business matter does not alter this. For me, Slack is well chosen, even though I use it mainly for work related communication nowadays.
A very very long time ago, SB created a social game called GNE (Game Neverending). The game (and it's participants, of whom I was one) were somewhat whimsical.
Based on this, I believe the reference to "slack" is a reference to this: https://en.wikipedia.org/wiki/Church_of_the_SubGenius
("Slack" is "the ability to effortlessly achieve your goals")
But I could be wrong! "Slack" (also known as float) is also something you build into a project to help minimise the risk of failure: https://en.wikipedia.org/wiki/Float_(project_management)
Maybe we will never know.
Judge for yourself, having read his resignation letter from Yahoo: http://www.businessinsider.com/stewart-butterfield-epic-resi...