Always an interesting discussion.
I had to transport my bag out of necessity due to injury. So Yes, I had to know my destination each day. I actually didn't find that too restricting. I started off with short days and gradually built up. Then cut down towards the end again as injuries worsened.
In 40 days I don't think there was actually a day when I regretted having to stop where my bag had arrived or indeed push on to where it was, still some way ahead of me. Perhaps the secret is to be realistic in your abilities and just think carefully about how far you want to walk the next day, the villages and towns along that section etc etc A couple of days I walked too far, and made injuries worse, but pack or no pack would not have made a difference as the villages were far apart on those days. i.e. I couldn't really have stopped much shorter anyway. And wouldn't have wanted to.
I had planned to transport my bag for the first few days anyway. So whilst all my gear did just fit in my pack, I also tucked in one of those nylon zip up bags. See pic. You'll all know it from the pic. Weighs almost nothing and very strong.
That was my 'luggage' and it survived being transported for
40 days!
But of course I had my full size pack, in case I did want to carry it all.
I felt much more comfortable walking with my full size pack than some kind of skimpy day sac. Because it was very comfortable, and I could fit in all my stuff for the day very easily. Waterproofs, water bladder, spare socks, medical gear, food etc Having a full size pack, and the zipper bag gave me all the options. Carry everything, carry some, or just carry the bare minimum. Actually I did have one of those sea to summit nylon day packs, that weight about 50 gms as well! So that gave me the option of literally just carrying a water proof jacket and a bottle of water if required. I never ended up using it really. My main pack (Osprey 32L) was just so comfortable.
So I guess my 2 cents worth, is plan to give yourself lots of options....in the way that you pack and what you take.
And as others have remarked:
It's your Camino, walk it how you like!
and
I also never saw pilgrim statues or paintings that showed heavy back packs