I love using Sketch and I have very few knocks against it.
THE BIGGEST THING I WANT: MAKE A WINDOWS 10 VERSION
Affinity Designer, Affinity Photo, Figma, Invision Studio, Adobe XD, Webflow, Gravit are all able to work on a PC (even if it's only a web version). Sketch should follow suit. We no longer live in a world where UI design is exclusive to Mac users