I have installed the new Beta - with mixed reactions.
The interface is clear and much less cluttered than your rivals, but I think that your 'out of the box' defaults could be much improved.
I do not know whether your remarks about the public version explain my problems with it. It launched and ran as expected, after I had clicked the '10 day trial' box. It took a while to find the way to switch from dark theme to light - perhaps you could have a setup phase in first use.
But I could find no way to make pressure vary the brush line thickness. The 'more' tab seemed promising, but gave no way to vary what was drawn. Then I set the mode to 'velocity' instead - still the line thicknesss was constant, although the width variation slider was at maximum.
Windows Ink has given an expectation that pressure will show immediate results. Many applications include a 'calibration' stage for pressure, which shows the user that pressure is actually being seen. Gimp has an 'inputs' option to select the signal sources. Unfortunately Serif Drawplus does not, causing the paper to slide about because of touch signals - other wise it would be a contender.
There is a bug in the pressure profile setting in the 'stroke' pane, where the left and right ends lock together - fortunately a linear preset can be chosen, but pressure still has no effect!
I will now download your production version and choose the 10 day trial, to see if the version is the problem.
My designer wife has followed Corel Draw ever since Corel 1.1, spending a total of some thousands of dollars. Corel 5 was simple and useful, but included and then abandoned Ventura page design. Corel 8 was a good standard, leading on to Corel 13. But then came Windows 10 which killed off all versions before Corel 17. The prospect of spending $800 to add Corel to her new machine ruled it out of contention!
PS This is not my main email address, but supports a book on control theory - see www.esscont.com