I always thought I couldn't have a UK passport, I called the helpline circa 15 years ago for info and was told I couldn't. (I was going to switch because my Irish one had been stole and I had previously lost one so I was being penalised by the passport office Ireland)
I looked it up again and I am fairly certain I can. I was born in England to Irish parents in the late 80s. I lived there for about 8 years in total but my mam got me an Irish passport.
Do you think you'd get one now just to have the two? I can't really see any benefit to it? I was thinking for my children it might be helpful but they have my UK Birth cert if they ever wanted to apply themselves. Also the common travel area doesn't seem to be changing.
I live in Ireland and only visit the UK every few years. All my UK cousins have been getting Irish passports lately!