No (real) customer has ever, or will ever, care about this. Discord and Slack are pretty much case-in-points: bloated Electron apps that just about everyone on the planet has installed on their computers. I personally hate React, but technology decisions are irrelevant to the long-term success of startups. (As long as they don't grossly interfere with customer experience, the feature set, etc.)
> Final Warning: After analyzing hundreds of email startups, the evidence is overwhelming - 80%+ fail completely. Email isn't broken, and trying to "fix" it is a guaranteed path to failure.
First, I'd bet money that figure is actually wrong: the failure rate is likely way higher than 80%. And I'm honestly not sure how anyone could seriously think a 20% exit rate is bad in just about any vertical (but especially a "boring" one like email).
> Resources: Volunteer developers can't sustain enterprise-level software
What am I even reading here? Author does realize openssl[1], Linux[2], and many other "enterprise-level" pieces of software are entirely (or almost entirely) maintained by volunteer developers, right?
Anyway, the post had its opposite intended effect on me: it made me think about ways I could reinvent email.