You may find the 6+ level of refreshing acceptable (and I can't argue with your own requirements) but is the fact the multitasking capability has been significantly downgraded over the two generations older iPhone 5 acceptable?
I think it's better to ask whether or not something does what it needs to. It does for me, and that's all that matters. I do wish that it had more RAM, sure, but the idea that with a single GB of RAM it was not properly functioning.