Yep it definitely seems to take at least one step back for every step forward. Most recently I’ve been annoyed by it deciding that ‘grams and cups are not compatible’ is a suitable answer when I ask for a conversion - for a specific ingredient. I get that they’re not directly comparable but they are if you know the material, and Siri used to be able to do that! Not for everything, but for a lot of common ingredients like flour, sugar, butter, oil, etc. I used that all the time when cooking from recipes that use volumes, it was really handy and it’s so annoying that it doesn’t work anymore.