The bolding of keywords in the URL and in the Title for the SERPs is something that continually goes through testing.
The Title & Description are used less for SEO and more for a Call To Action for individuals to click on a page. If structured right, it should look/sound like a 15-second elevator pitch.
Bolds in the Title were big on Google for drawing attention, and they're still bolded on Bing. The words are still bolded at the bottom of Google searches under the "related search" section.
It *MAY* come back into regular search at some point, but it's definitely good to have your keyword in the title (again, less for SEO, more for CTA)