I like their products. I just want printing without fuss and without having to learn every detail about leveling, etc. Their product works for me and I do not care about its openness, it is about as important for what I need it as my headphones being open sourced (not at all). So this product is for my use case, not for people who want to control every aspect of their printer and every software feature.
The problem is that their model works until it doesn't.
Having a good out-of-the-box "it just works" experience doesn't preclude letting people tinker. If anything, letting people tinker results in a better out-of-the-box experience in the long term, because the manufacturer can see what people are doing with their technology and can clean it up and make it more broadly available if it is useful. The key is ensuring that the default experience doesn't require tinkering for the majority of customers. And seeing people tinker shows you where the sharp edges are that need to be polished.
But more than that, locking down this sort of hardware means that when you inevitably run into some limitation, if the manufacturer doesn't provide a way around it, you're stuck. And the problem is that a lot of users of advanced tools like this are in a situation where 90% of their use is common to all other users, and 10% isn't. And different users have different 10% use cases. So you could be in a situation where 80% of your users need one thing that your product doesn't support, but it's a hundred different "one thing"s. This makes support very difficult if you don't allow tinkering.
But the worst part is that you can't know for sure whether you're going to be in that 80% until you run into the use case that they don't support out of the box. It could be a week, a month, a year, or several years. And then you're stuck with this hardware that won't do what you need, with no way to fix it, thus forcing you to replace it with a product from some other manufacturer.
So even if you don't think you will ever want to tinker with your 3D printer, assuming all else is roughly equal, you're better off choosing the printer that gives you the most control of the hardware, because that is the least likely to box you into a corner and make you regret your purchase someday.