If Figma helps building lean designs it's good otherwise not.
Designers tend to put too much useless parts into sites, like unnecessary transparencies and animations.
The latter one is harder if you only have a knife instead of an assault rifle.
On mobile I have a limited data plan and the speed isn't always the best and on many pages I have to wait because beside the ads I have to download 3, 5, 10 or even more MB of data just to get pages where button, links and headline are undistinguishable because of recent design decisions.
Seems to me these tools are worthless in the end, if you are a user. After bootstrap it went pretty much downhill.
Not great at animations, not great at fully exploding all of the app state. Overall pretty good middle ground for designers and devs to interact.