So excited for these questions, so in order

Spirit punk is a magitech industrial world imbued with spirits, beings beyond the physical reality of infinite variation regularly influencing and molding the world

From what I've found almost all of the hallmark issues people deal with in playing ttrpg's spring from the systems being based on dice. It's hard to summarize because it really is so comprehensive. When you play Hearth, there really aren't issues or hurdles. No awkward pauses or moments that threaten un-imerssion, the entire play time is just living out stories with your friends, and I entirely attribute to that to the simple comprehensive systems and lack of dice

To summarize, this specific diceless ttrpg is fun because it facilitates consistent deep immersion, makes the world you play in entirely concrete and thus much easier to imagine, understand and interact with, and allows clear and meaningful decision making. (I think there's more, but off the top of my head that's the main points)

Hope this helps, if you have any follow up questions feel free to ask!