I was thinking at the differences between SLR and DLSR (in Manual mode). In both cases you can change aperture and shutter speed as it suits you. But with SLR you are stuck with the ISO of the film which you happen to have in the camera at the moment, while with DSLR you can vary ISO as you wish, too.
Now maybe the question is naive, but how is this handled in practice?
I imagine that it requires more planning: you want to shoot today under this particular light and you choose a specific film roll rather than another. What if you find a nice shot but there is a shadow which changes the light: you can recover the exposure by changing the other parameters but this is not side-effects free obviously.
What are the effects of this "freedom" afforded by DSLRs? Is it making me (a complete beginner) lazy because I am not forced to think about it? Is it freeing me of a burden by removing an unnecessary constraint?