lf-araujo since Solus' inclusion of gnome-software
into the repo, I have personally read, on the forum, about 2 people who updated their firmware through gnome-software
and were grateful for the feature and rebooted without incident. And those two 'thumbs up' came in the last six weeks here if I had to guess.
I personally don't use it, but would I make a decision based on other's positive firmware update anecdotes here? Yes, I'd trust what I read here.
2 cents.
That said it's gotta be safer than USB flashing🙂