By all means support them, it allows the content to be created at whatever pace people permit to them. If people are okay with the meandering then that is quite fine. It is however concerning to Me as I work in the field, understand development processes, incentives, and believe the progress/payment ratio to be off. Which is why I pulled my donations from 3 developers. I wish them all the luck and admire their product to be sure, however I will not be part of the donation pool until things are released at more regular intervals. If it changes I will start back up again.
No, look, unless you are creating adult games on your own, you work in a different field with other rules and surely different progress/payment ratios, and you're judging them with those different values. This is not intrinsically wrong: in the end, we all make our choices according to our views. For instance, I have other criteria to choose who I support but, as it happens, I don't support Magicnuts financially, just like you - but in my case it's because, at this point, my 5 bucks wouldn't make any difference, so I prefer supporting other devs I consider underrated.
The thing you should note, though, is that this scene is not an actual industry like the one you're presumably part of. Even if there are a few proper studios (kind of), it's mostly made of solo devs who aspire to keep working solo while earning a comfortable living wage. Sure, when you work solo and you're getting a good amount of cash that doesn't seem to drastically recede even when you work 'slower', there's an incentive to not push yourself up to your max. But then is up to each individual to choose which path to follow. And those games you used as examples are indeed the perfect example of successful ventures in this weird business: they are talented, serious, committed people creating quality products and who managed to live off them, which should be everyone's life's goal - and who keep giving their best instead of slacking. They have a nice cushion that lets them work in a more relaxed way (maybe, because these Magicnuts guys claim to be working on their game 7 days per week for some months now) but this is not translating into worst products.
Updates are taking longer to be released? Yeah, that's a fact. Another fact is that we are yet to see a drop in those projects' quality that could justify using the word 'concerning' in the way we tend to understand around here (and that you also used when you mentioned the risk of devs releasing just the bare minimum content to stay on patreon). No, each update is bigger, more polished and more complex than the previous one. So I can't really get this negative view of what *might* happen when the reality is that those projects you mentioned are precisely two of the most reliable and trustworthy projects out there. I do believe that people who tend to expect the worse from successful devs with clean records are either victims of some scammer or probably just projecting their own fears of what they would do if in their shoes.