markdown is code
Here's where I disagree. Markdown is just text. All its styling is designed to be human-writable and human-readable. As a comparison, classic Reddit doesn't use monospace, neither the default UIs of Lemmy or Piefed use monospace. YouTube, which uses not markdown but its own kinda similar markup language doesn't.
On the other hand, GitHub's on-site text editor is always monospace, and questions & answers on Stack Exchange are edited using a monospace font.
I do think there's something about the specific font used on Blorp that makes it worse than SE, which definitely doesn't help. But my overall feeling is that because it's mainly aimed at writing text with a little formatting for spice, a proportional font is more appropriate.
I've actually been using Blorp as my main UI for the last few days. I love the fact that it's so friendly on mobile. And even remembers where I left off in typing a comment if I close out of typing the comment, for example to go back and read more of the thread's context.
Some small suggestions: the PWA/installed webapp experience could be better. It doesn't use the app's logo/favicon as an app icon. And it opens in my browser itself, rather than in a separate "app" window (the way that, say, Cinny—the Matrix client web app—does). Though this might actually be to its advantage, since it makes "open in new tab" more convenient...I haven't fully decided yet. I'm also not a fan of the app auto-refreshing if I reopen it after a while.
An easy way to get back to a specific comment thread would also be nice. In other apps, either clicking on the timestamp or on a specific "permalink" button (e.g. "🔗" or the fediverse logo—though the latter tends to be a permalink to the canonical source, i.e. the comment on the commenter's own instance, rather than an internal link) takes you to a link that keeps that specific comment at the top. I often use it if there's a specific conversation I want to come back to later (e.g., I'm awaiting a reply to a question someone posted which I also share). I'll open the permalink in new tab, then go back to the main feed to browse something else in the meantime.
Blorp is definitely my preferred way to use Piefed right now, and has contributed a not insignificant amount to my increasing use of this account rather than my Lemmy one. So serious kudos for the great work you've done on it!