I find it sad that we are now in 2021 and the fonts issue hasn't been resolved. Even this discussion group lets me have choice of fonts and size and colour
I have kept an older version of Skitch App (circa 2013) on an iMac computer on system Sierra as control of fonts in labelling Skitch Screengrabs is so useful. Over the years I have accumulated info in those screen grabs of house plans showing where all ethernet ports are, aerial maps with danger zones etc. These pictures are so very useful and worth a thousand words with the fonts varying in size and arrowed labels. Surely with every other app using varied fonts and emojis it is not too difficult over nearly a decade to improve and use the native font library - 64bit surely gives wider presentation choices.
This influences me in subscribing to Evernote/Skitch as I really have to use Preview or Pages in a much more cumbersome way to emulate what was SO SIMPLE in SKITCH APP v1