Lightroom is great, don’t get me wrong. This is about what’s missing or could be better.
Lightroom is slooow. Let’s be honest, Lr is a huge memory hog, and would benefit massively from being able to use a real database.
Lightroom does not know the difference between orientation and aspect ratio, it thinks that landscape, portrait and square are aspect ratios; ever tried to find your panoramas in Lightroom if you havn’t tagged them? As managing and sorting images is a major part of Lr’s remit this is a major failing.
If you use multiple machines it’s essential to write the metadata to the file or an xmp sidecar.
It’s nearly impossible to run Lr & Ps on a 4G MacBoook Pro at the same time