yaru-theme-* 18.10.4, Ubuntu Cosmic
The icons for Ubuntu Software and Software Updater are both based on a capital letter A, with a thick stroke on the left and a thin stroke on the right.

This is back to front. In typefaces with variable-width strokes, strokes running northeast-southwest are nearly always thinner, while strokes running northwest-southeast are thicker.

This issue is trivially fixable by flipping the icons horizontally, except for the progress bars. However:
[[Originally reported in the Yaru forum](https://discourse.ubuntu.com/t/call-for-participation-an-ubuntu-default-theme-lead-by-the-community/1545/1750).]
I'm coming from MacOS and I just wanted to confirm this:
It’s misleading for an icon to include a fake progress bar, when most people who used Ubuntu from 2011 to 2017 (or recent versions of macOS) will have seen launcher icons overlaid by real progress bars. So it may be better to remove those altogether.
It happened more than once to me that I interpreted the fake progress bar as a real one.., I can imagine this happens to lots of other users as well.
Second, when actually updating, a real progress bar appears which looks like this:

Which also doesn't look ideal to me, so having redesigned software icons would be really nice.
Now reported as suru-icon-theme#93.
Closing this here as you reported it upstream, thanks for reporting!
Most helpful comment
I'm coming from MacOS and I just wanted to confirm this:
It happened more than once to me that I interpreted the fake progress bar as a real one.., I can imagine this happens to lots of other users as well.
Second, when actually updating, a real progress bar appears which looks like this:

Which also doesn't look ideal to me, so having redesigned software icons would be really nice.