I would prefer to know, even in ambiguous terms (e.g. "synthesizer," "electronic keyboards" etc.) what was used. But I don't need to know too many specifics, e.g. I don't need to know the brand of synth or which model.
I think the inclusion of synthesizer brands has a historical element to it that started with the Berlin School, perhaps even earlier as names like Moog & ARP were responsible for the unique sound that was produced. They are still instruments that need to be played by the musician but because they gave birth to electronic music these instruments were given credit on the ablums. Thats how I like to look at it and part of that still continues to this day.
With so much audio processing and manipulation going on in ambient/electronic music where a violin, oboe, and say a flute are recorded, processed & stretched into beautiful shimmering sonic timbres it is important as Bill mentioned that these instruments be listed so we can get an idea of the artistic process. Would it matter if say the violin was a Stradivarius?
Regular people listen to ambient music to get the samadhi which is where we all start from. Maybe that's why mp3s and other digital audio are more popular than CDs - no mention of the equipment involved!
As our listening habits today are built around convenience, production notes and equipment certainly have no billing today and perhaps this ended generally with the demise of the vinyl. As a kid I remember sitting in my room with headphones on looking and reading those 12" double record covers, lyrics printed on the sleeves, studio shots or live performance pictures and quite often instruments listed with brand names.