When working on JPEG files, should I start by converting the images to 16 bit depth? Supposedly that would make for more room for the adjustments I'm going to make on the photos. Two occasions that recently popped up while I was reading around PhotoSE questions mention this conversion:
Philw in his answer to "What is the optimal order of post-processing steps?"
Back in the day people would worry about doing most work in the maximum bit-depth and then converting down for output. There's nothing wrong with that principle, but in practice you should be able to do everything you need in the raw converter, so it's a moot point.
Hermann Klecker in his answer to "How much post processing advantage is gained..."
However, there are significant advantages in the further processing. After opening a file in photoshop or whatever, the next step should be the conversion into a 16-bit format. Any interim result should be saved in a non-destructive 16-bit format too. If the final result is to be handed over or uploaded in any 8-bit (sometimes jpeg is even required) format, then it should be the last and very final step converting the file back to 8 bit.
Is it really a must? Do I notice the difference if I don't do the work in 16 bit?