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It’s obviously not for every body but I hate tags because they are so random and I would forget what I used. I’ve been successfully using the Johnny decimal guide for a few years because it’s intuitive for me. Your examples are obvious for me: health expense goes into “Receipts > Health” and travel expense goes into “Receipts > Travel.” If I had to use tags I would think of “health, personal, money, receipts, bank, medication, etc.” and it would be a real mental struggle to categorize everything and remember all the tags I have ever used. Also I use Joplin and Obsidian which make this kind of organization easier.
The “no more than ten” principles forces me to put everything in the most generic category I can think of. And if I need more than 10, it’s a new project or a new something. But I agree it’s not for everyone, it just happens to be suited with how I’m organized and how I think.
Some idiot bought a $2000 bed. IoT or not, it’s a nice bonus.