I share some of your sentiments. Here’s my 2 cents on where I’ve landed. Sorry for the long winded text. I’m very detailed in my thinking

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1. Centered Clasp: The more I’ve thought about it though, as someone who has worn watches and loved them my whole life, every metal bracelet has a good chance of not being perfectly centered on someone’s wrist. Most bracelets require an odd number of links for many people, which makes it slightly off center. They would need to make a much larger number of sizes to achieve this. My guess is that only those who are nearly smack in the middle of each size are getting very centered clasps.
2. Loop Size/bend: I completely agree that it would look cleaner if the loop at the end was tighter. I don’t think there’s any way around this without making the material thinner, which isn’t what they were going for with this band compared to the original Milanese Loop. Some watch companies deal with excess material by keeping in more towards the underside of the wrist, by using links that match the mesh appearance on the bottom or by using a traditional watch strap clasp and holes in the band. I’m guessing that Apple’s method might fit the widest number of wrist sizes, but I don’t know.