OpenToonz is ugly and difficult to use, two big detractors for drawing hopeful new animators.
A lot of the hype around OpenToonz was it's connection to Studio Ghibli. They aren't the only ones using Toonz products, but there aren't many studios using Toonz, and Toonz products are not exactly an industry standard. Well, they're not an industry standard. And that kind of says it all. The software that you could pay for, advertised as competitively priced, has not become an industry standard. Though, it's listed without a price, and most things listed without a price are rarely competitively priced. So, what can you really expect from the stripped down free version of the software that never became an industry standard?
The idea that OpenToonz will become a global standard for 2D animation is more fantastical than anything you'll create with it.
As someone experienced in paper animation, you might see OpenToonz as an amazing offering. Sure it's ugly and far from user friendly, but it probably offers everything you need, at no cost. However, most of the open source software I've seen falls under the same two categories, ugly and not user friendly. Eventually, and I mean after a decade or two, it improves to the level where it can be appealing because it's free. Usually, I'd just rather pay the subscription price or retail cost for a better made software. Yes, it does basically all the same stuff, but it looks better and it's easier to use. Two really important factors when it comes to software I need to become proficient in, and software I have to look at for hours at a time, every day.
I don't have to pay anything extra and I have a number of options, better looking and more user friendly than OpenToonz. More importantly, all better geared for what I want to do, which is paperless animation. OpenToonz has nothing to make me invested in utilizing it for my projects. Even if I wanted to, OpenToonz has another major pitfall - horrible documentation. For the small percentage of the world that wants to animate and speaks Japanese, no problem. However, I don't speak Japanese, and there is no English documentation for the software, and no English video tutorials.
Although, I'm a resourceful dude. I've had it a week now. I haven't been able to do much, but I was able to get things more organized. I was also able to get more comfortable drawing and manipulating frames, though the drawing and painting tools are atrocious. I even learned how to preview my animation, which I [sadly] saw as a great triumph in my time with the software. Even more sadly, when I finally felt comfortable and confident enough put something meaningful together, I was hit with the unexpected crashes plaguing most users. I don't really understand how a program this unfriendly to users, without documentation, and this unstable is suppose to become a global standard for animation. Since it's open source, it will probably be a decade or two before it competes with the current set of professional options on the market, and that's more time than I'm willing to give it.
Digital Arts Instructor