Not at all close to the design tool—features like autolayout and performance are significantly better than anyone else on the market.

Both of those are pretty close to FigJam, Figma's. whiteboarding tool. It's a nice tool, but that's not why anyone uses Figma.

Not really, no. Miro is a giant whiteboard/brainstorming tool. Canva is a presentation tool, like Powerpoint. To say they can be used for design is saying that MS Paint or Photoshop can be used to design mockups... sure, but that's not really what they're made for, and it would be a painful experience (even Adobe learned that, eventually, and tried to copy Figma by making the separate Adobe XD tool)

You can try to coerce those other apps to make wireframes & mockups, but Figma is much better for both designers (the layout tools are phenomenal and CSS-like) and devs (the exports are good, there's CSS code to copy, a bunch of plugins, etc.).

I've had various product people try to make mockups in Miro because they didn't want to learn Figma, and it usually ends up being a bunch of screenshots clobbered together. That's a lot harder to work with than being able to click on a particular component in Figma and see its exact color, border radiuses, flexbox layouts, etc., and then to have entire widgets, dashboards, screens, and apps composed out of these components and built into a functional interactive prototype that stakeholders can review and comment on and devs can inspect for technical details. Figma is really really good at that.

If someone tried to send me one in Canva, well, I think I'd just quit right then and there lol. (Don't get me wrong, Canva is a great tool for presentations, but not for sharing designs)

Not... really. Sketch is what is most analogous.