Virtually every device I use is USB-C now and I couldn't be happier... from my just-traded-in Google Pixel 3 XL, to my newish Samsung Galaxy Note 10+ 5G and just-acquired Samsung Galaxy Fold smartphones to my Qualcomm Snapdragon-powered Lenovo C630 and new Microsoft Surface Pro X -- they're all USB-C. USB-C has been a game changer in the smartphone/laptop worlds. You can power smartphones, entire super-fast storage solutions, monitors, and so much more through a single connector.
Apple launched its first-gen Watch back in 2015, and has sold 10s of millions of Apple Watch products since. Apple launched its Watch to compliment an iPhone, so if you're using an Android smartphone (like me) and want to enjoy one of the, if not the best smartwatch on the planet -- sorry, you can't. It's an iWorld here but Apple has really carved out a huge space for itself and not let go of it since 2015.
Dell XPS 13/15
Dell really stepped up into its own game (yet again) in a post-private world with its revamped XPS 13 and XPS 15 laptops, with the beautiful 15.6-inch UltraSharp InfinityEdge display that really provided a kick ass and truly beautiful mobile system. It had some great technology inside but it was ultimately the design and the display that really shined with Dell's XPS 13/15 laptops in 2015.
Ethereum (for real)
This is the time when Ethereum was a real thing, and kicked off what would eventually become a gigantic wave of cryptocurrency mayhem over the coming years, especially with Ethereum mining in 2016 and onward.