I've been modding for perhaps twenty years now, IME, both film and electrolytics have improved, I presume for all the reasons above. Really, very few choices years ago with boutique caps, most were general use variety. As I recall, the first audiophile grade film caps I used were from VH Audio, Duelund, Jantzen, Mundorf, seems like they all came to market in about the same range of time. So many brand choices today, way more values, voltages, metallurgy available today. I've yet to hear a bad boutique film cap in my mod projects, only sq issue has been less than preferred colorations, large physical size sometimes makes fitting a chore.
