Basically the benefit of doing it yourself is cost & you get the food you actually like to eat. I'd argue you can make more nutritious versions of things, too, since you know exactly what goes in it.
For things like curry/chilli the important bit is to remember a dehydrator just removes water from the food as it dries it out, so there's little point making a stew then trying to ladle it into an extractor to spend hours dehydrating it. So make it as normal but try replacing anything which is inherently very damp with a drier alternative which still gives flavour.
General tips:
1. Make your food as you would do normally but use the leanest meat you can (fat doesn't dehydrate well) and dice everything so it dehydrates evenly
2. Be careful with spicing/flavours, when you dehydrate it tends to become stronger flavours so remember you can always carry a (practically weightless) container of spices but you can't take it away once it's mixed in
3. For things like tinned coconut, tinned tomatoes - replace them with diced real tomatoes, or tomato paste, dried coconut etc. Try to make it more of a 'thick' curry or stew so you spend less time dehydrating it.
4. Dehydrators aren't complex, but you want one with a fan, multiple trays, and ideally a timer. That way if you're out for the day you'd just ladle it onto greaseproof paper put on each tier (many dehydrators have 3-6 tiers where you can spread out food to dry it evenly), set a timer for x hours and then you can go about your day. I'd consider the fan the most important feature, by quite some distance.
Some people go all fancy and use a vacuum packing machine so seal their food, but we found just using knotted food bags and putting a pile of them in the freezer was a great way to always have something you like available when you head out and was a real upgrades on the usual mix of supernoodles/cup-a-soups which are the tier below pre-packed backpacking meals. About six months of being sat in the freezer is probably max you'll get, but having a weekend of cooking/dehydrating set you up for a full backpacking season seemed like a pretty good way of doing it.
Probably loads more tips, in general it pays for itself very quickly, especially if you're the kind of backpacker who can stomach a larger evening meal but doesn't much care for breakfast.