Query/Request
Are there any Deltachat clients that can display messages like a conventional mail client, with an inbox, drafts, filters, folders etc.?
Ideally I’d like a desktop client where I can set some accounts to have a chat UI, and others to have an epistolary UI. Two separate clients would also be fine.
Reasons
Chat is nice, but sometimes you want to send a long-form letter, especially when the recipient is on a very different sleep schedule. Ideally, I’d communicate with the same friends through both formats.
Communications work better when the UIs match. I generally don’t want to chat-format conversations with friends who are using a classic email client. Conversing across this difference in UIs is a surprisingly substantial bit of friction and discourages unilateral adoption. Also, if your emails are weird others assume it’s because this new Deltachat thing you are using is rubbish.
Userbase
Several people have said, on this forum, that they use Deltachat clients for regular emails. They might also like an epistolary UI. Let us know 
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There are plenty of people who want a classic epistolary-UI email client, but also want encrypted email that is not nearly impossible to set up (there are people who’ve wanted this since the 1980s). I’d like to be able to tell them about “an open-source email client, but it complies with the Deltachat open standard. That means easy end-to-end encryption, with any correspondent also using a Deltachat-compliant client”. They’d go for that. Telling them that the standard also enables text chat, and peer-to-peer, and these things called webxdc apps, and so on, would be secondary (and some of them would actively not want that functionality, and prefer a client that lacks it or can turn it off).