In my early years of digital shooting, I used cameras that were jpeg only, a combination of P&S and "compact" cameras,and was "stuck" with basic jpeg software for whatever work I needed to do on the images.
But that did have frustrations, in that I could see the limits of the processing that could be done to jpegs, especially any attempts to fine-tune aspects such as color and tonal qualities, including highlights and shadows.
Although I did aspire to "get it right in-camera, sure, and even to this day, I can work with jpegs and even have nice prints from over the years...
Then, as I moved along, the subject of RAW files and processing came to my attention, addressing the problems I had experienced with processing those jpegs, and that did indeed get my attention, and I initially had not taken the "leap" into having a DSLR that did offer Raw files, and also at the time I hadn't made the "leap" in my processing software. I was aware of apps such as Photoshop, but I initially went with Photoshop Elements, which gave me "tools", but were at the time not set up for a Raw workflow.
But then, once I got to where I was decided on making the move to a DSLR for all that that entails, and I did make the switch to the Raw format, which initially was handled by PS Elements, and I eventually did upgrade to Photoshop "standard", which had theimplementation of Adobe Camera Raw that helped things along!
Anyway, for me then Raw became the default! It was a very good hands-on way of collecting and processing my photos/files, and as such became kind of a "no-brainer" operation!
Then, the question of how we photographers might "manage" our images and our photographic workflow became a major issue/topic of discussion, and it was in this time that Adobe launched on the development of Lightroom, and Apple with Aperture...
At the time, Raw became recognized as the "best" format for "serious" photographers, so that a workflow for processing their photos in the "digital darkroom" became increasingly evident as a "Raw workflow"...
And, as such, Lightroom when it came out was a Raw-Only app, and it, together with the Photoshop Camera Raw app/plug-in could take in images that were shot with a recognized Raw format. At the time, sure, you had a limited amount of "work" you could do with your jpeg shots and such, but the Raw processing that you could do was so much better than working with jpegs!
We kept dealing with this over time, until Adobe opened up Lightroom and Camera Raw with photoshop to take in and handle other image types, such as jpegs and tiffs and such, and gave the same tools to edit and manage that whole variety!
As one who had adopted Raw as the one default image format, it was interesting to see that you could, in fact, shoot /work with jpegs, although the benefits of the Raw format were still solidly in place!
***My Raw + Jpeg "TRIAL" ***
I did once, while doing some active "sports/event" shooting decide to try doing some "RAW + JPEG shooting, sure, I had a camera that took a second card, and I made that setup, Raw in my "normal" working card and Jpegs in my second card, which was a smaller SD card, so I gave it a try!
It was interesting! For one thing, since I did set out to "get it right in-camera, It was kind of funny, since for an active day I ended up with about 1,000 shots, and, since I had a "portable setup with a laptop with Lightroom, and so I ended up with all those photos in both Raw and Jpegs, I say "funny" because I sat there looking at duplicates of all those photos, going through 1,000 Raws and also 1,000 jpegs, side-by-side in my software, and I ended up just throwing up my handsand I deleted all those dang jpegs, I mean, why the heck would I want to have to keep/deal with all those duplicate photos/files?
now sure, I could "use" those jpegs, as a quick "look", and since I had set out to get optimum exposures, fitting White Balance and such!
But, I was still faced with the advantages of "tweaking"/ fine tuning those images where Raw still stood its place!
Today, I actually ended up picking up a little "compact camera for a "real deal", for $5.00 I walked out the door with one! So sure, today I can set off with a little pocket camera and come back with a bunch of jpegs, but I'd still be faced with the same fundamental difference/advantage of Raw!
Lightroom is still my "workflow app", whether for jpegs or Raw, I just still stick with my Raw workflow for the advantages in processing the dang things!
Well, that "settled" that, I never switched back to the Raw+Jpeg setup. It was too much of a hassle for me!
So much for me and my story! 