Everyone is entitled to their own opinion and if you want to keep both, that's totally your call.
But...it seems almost as though people want to retain their UK passport almost as a kind of lucky 'touch wood' thing. You know, just in case they want to return to the UK. If that were the case though, couldn't you go back on either passport, or just apply for one when you need it?
Being a citizen can be more than just having a passport for sure. I believe people who migrated before 1984 were given just about all the rights and responsibilities of a citizen with regard to voting etc. So it's not just that cos even if they can vote, they couldn't hold an Australian passport. We have a friend who has lived here for some fifty+ years, he can vote but still has to use a British passport because he has never applied for citizenship. He doesn't care but neither would he consider himself British - it's just a way to travel, a means to an end.
For us, applying for citizenship was more than being able to have a HECS/HELP debt, although that is pretty helpful, it was a way of becoming part of our new country. We are all proud to be able to say we are citizens, people who want to stay and contribute to our new country. Our friends were very pro it as well. We got back from the UK today and one of our best friends came over to hug us and say it was good to have us home. And that felt good. Good because this is our home and good because our friends actually seem proud that we want to become a permanent part of their country. And when we travel abroad, I think our Australian passports show that.
That probably sounds like emotional claptrap lol but that's ok. None of us are likely to change our mind based on comments on here but it is nice to get an insight of why others feel differently. If that makes sense.
And finally, we didn't leave because where we lived was bad...we came because we could!
I think I'll go to bed now