I have a question concerning the two brushes b) Basic-3 Flow and b) Basic-4 Flow Opacity: Why is “Rotation” enabled in those two brushes? Is there a specific reason? Because that doesn’t seem to make sense. 
This is a question for those who made them, so most likely @Deevad or @RamonM, but this can be a forgotten setting from a brush you took as base to create the ones in question, or because the initial shape of the brush tip wasn’t a round shape. Just let your imagination flow, and you will find more thinkable reasons for such a setting, the one fitting for most decisions made is that we are humans and because of that extremely often not rational, even when we believe we are.
Michelist
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@Kronos : Probably a mistake I left while making the presets for Krita 4.0, mea culpa 
But don’t worry, even if the Rotation checkbox is selected, none of the rotation effects is applied (the checkbox “Enable Pen Setting” is deactivated and all the panel is grayed). So, it shouldn’t affect the rendering or performances at all.
Unfortunately, pushing an update fix this to the big brush kit bundle file at the root of most of the brush preset to all users is probably dangerous and hazardous in a way for almost zero benefits. In a way, an update "shouldn’t interact"™ with all user’s made presets since the refactor in Krita 5.0 for the new brush preset system.
So, I won’t fix it, I guess. But I wish this type of information could be easy to find back later if the team decides to update the Krita default bundle; to not forget about this type of tiny fix, but I don’t think KDE’s bugtracker can handle a “someday” type of report: it’s now managed afaik by a bot that autoclose unactive bug report. So, maybe this type of info belong to somewhere else and I don’t know yet about it (a wiki? the doc? a table somwhere?). If someone knows, let me know. 
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@Deevad Very interesting! Well, if it’s not broken, don’t fix it! And I think this “leftover” of enabled rotation in those two brushes is actually a good thing, because I primarily focused on experimenting with basic render and airbrushes and that enabled rotation without enabled pen settings attracted my attention and gave me the idea to experiment with rotation. I probably never would have thought of experimenting with rotation without that “leftover” in those two brushes! 
I agree 100%. 
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Is not pretended as David said before, but it could be helpful if you change the ratio of the reound brush and then you have a flat brush
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