Fonts render poorly in Safari on MacOs when zooming in on a card. I think crisp fonts are critical to readability and hence usability of this tool.
This is a known effect of our current architecture that optimizes for zooming performance. Please vote here, if this disturbs you. The more votes, the earlier we will tackle this instead of other issues ;-)
Attached an example. fonts look great in edit mode but pretty bad when not editing the text. This seems critical.