Generally speaking, more expensive grinders are going to be better aligned, offer more grind size options, and have burr geometries that are suited to particular types of brew methods. In the case of hand grinders, they’ll also probably be significantly easier to crank than something like a Hario Mini Slim. I personally found that when I switched from the Hario to a more expensive hand grinder about 7 years ago, I was getting cups that were tastier and more consistent. I’m not going to pretend that it’s worth the additional cost for everyone, but for me personally it was about getting more of what I want from coffee rather than what I need.
I didn’t mean to imply that you weren’t concerned about the taste of your coffee at all, sorry if that’s how it came across! I tried to stay away from the elitist tendencies that creep in when talking about coffee gear because I find it counterproductive and off-putting, and what’s more important than anything is that we all enjoy the cups that we brew.
If you’re brewing with an Aeropress, I can see why the value proposition of more expensive grinders seems a bit suspect. It’s a very forgiving brewer (and the perfect size for travel), which is one of its greatest strengths. Immersion brewers are tolerant of a significantly wider range of grind sizes and tend towards producing rounder flavors and more even extractions. This is an obvious oversimplification of the Aeropress, since there’s some absolutely wild World Aeropress Championship recipes (especially from a couple years ago), but I think there isn’t a need to dial in much on the Aeropress because it’s so forgiving. I feel like I’d have to actively try to get a bad result out of an Aeropress, which is a huge testament to how great it is.
My personal preference when it comes to filter coffee at home is either a V60 or an Orea V4. Generalizing again, but the grinder becomes a lot more important in pour overs because it reduces variables when it comes to your extraction. A more uniform grind allows water to trickle through the bed at similar rates. Too many boulders and fines in the bed can lead to a cup tasting simultaneously bitter and acidic, which doesn’t really happen in my experience with the Aeropress. However, the cups that I get when I have the beans dialed in offer more clarity and flavor separation than I get from an Aeropress, which isn’t necessarily better, just different.
I’d tend to agree with you on electric grinders, by and large. It feels like you’re either better suited buying a hand grinder for the same price as your budget, or you’d need to spend substantially more for an electric grinder that can match a $200 hand grinder. If you’re interested in an electric grinder, a little bit handy, and have the counter space, you might want to keep an eye out for used commercial grinders. I’ve seen quite a few Mazzer Super Jollys and their rebranded cousins in my area, so you might be able to eventually pick up one in yours for a steal.