Too large/expensive; too slow and unresponsive, power hungry; no finder or IS
Limited sensor resolution; overambitious image quality and fragile feel; too many steps to get shooting
Fixed lens; great UI with terrible ergonomics; classical controls don’t work for digital, sensor limits
Ergonomic and workflow challenges; IQ limitations from sensor size; needed two years to fix FW
And this is barely half of the mirrorless cameras I’ve used and reviewed on this site in the last couple of years. I still have not found a complete replacement for the DSLR, and I suspect there are many other photographers in the same situation. It isn’t for want of trying or stubbornness; it’s because the product simply does not exist. We’re not asking for the unicorn here, either: there are ergonomic/UI/UX/engineering solutions that have already been implemented and received well in other cameras – just not in the same one. And to clarify (since judging by email and comments, many are missing the point): this post is not to complain mirrorless isn’t a DSLR. It’s recognising that mirrorless is the future for so many reasons – but we are still suffering from stupid design that has already been solved. All of these problems beg the question: just how difficult is it to get it right?