Interface changes — especially to core workflows, things that people have used for years — are always tricky, and must be carefully considered.
One (simplistic, but evocative!) heuristic we like to use is that of the carrot and the stick: if you're going to disrupt folks' muscle memory, you better make it worth it.
So: we've changed the way you send drafts, just slightly. Gone is the "send draft" button in the bottom of the screen; now it is hidden away in the Preview pane, so you click that and then you click Send draft.
(As always, you can check out the docs for more details.)
That's the stick. The carrot: you can now send yourself a draft for every transactional email or custom email (premium welcome/unsubscribers for paid newsletters, automations, welcome emails, and so on.) This makes it way easier to iterate on those vitally important notifications.
We've got a couple more changes planned this summer for the "previewing and sending" flow, and we promise that our goal is to make sure we keep everyone's use case in mind. Sometimes you have to move a couple buttons to make an omelet, as the saying goes — but we take such decisions seriously, with the goal of making sure we can provide the best interface possible over the next decade.