First of all it takes some mental adjustment to start designing things with these. Engineers need to build experience to avoid designs where unexpected forces of movements causes internal lockups due to misalignment, for example.
Second, the feedback isn't immediate in the way a physical object is, magnetism is always "springy". That means hybrid designs for many kinds of mechanisms with both mechanical and magnetic parts - see the paragraph above again for why this can be complex.
And then there's limits to the range, precision and maximum forces it can handle vs regular mechanical components.
Although over time I do expect it to show up in more and more places as it gets better understood, where these designs start to substitute classical mechanical designs where they're both good enough and more durable.
Second, the feedback isn't immediate in the way a physical object is, magnetism is always "springy". That means hybrid designs for many kinds of mechanisms with both mechanical and magnetic parts - see the paragraph above again for why this can be complex.
And then there's limits to the range, precision and maximum forces it can handle vs regular mechanical components.
Although over time I do expect it to show up in more and more places as it gets better understood, where these designs start to substitute classical mechanical designs where they're both good enough and more durable.
Also, another idea for these magnets: https://en.wikipedia.org/wiki/Kinetic_art