The SVG versions of the Unicons are not properly aligned in v2.0.1
Apparently I'm not allowed to attach images, but you can see an example in this Github issue: https://github.com/Iconscout/unicons/issues/41
I would expect the main subject of the image to be centered vertically and horizontally, but that differentiating details, like the "+" and "-" in this example, would not affect the positioning of the main subject.
This has at least three negative implications:
1. Icons are not aligned to one another. They do for form a straight line when placed next to each other.
2. The subject is mathematically centered, but not visually centered. For example, as you probably know you have to shift the "Play" icon slightly to the right to balance out that the triangle is "heavier" on the left side. In the SVG sources "Play" is mathematically centered, not visually centered.
3. Since the subjects are visually centered I assume that their positioning is not done to optimize crisp rendering.
To me, the first issue is the most pressing.