Curious about some comments I've read where people are recommending ditching the backpack and carrying everything on the bike. Maybe I'm just not minimalist enough, but that seems nearly impossible with any level of comfort. Having the backpack on all day kind of sucks, but without it I'd be hard-pressed to pack everything I need into the bags I'm rocking.
What say you proponents of the pack and minimalists?
Any generic advise like that is pretty much useless. It's like saying you should put 34.76 psi into your tires or should only use a specific brand and model of tire bikepacking.
Clearly we all have different needs, wants and situations to address.
You need to work out what gear you need to be comfortable and happy bikepacking. That answer varies widely between people. So how they carry their is going to be different.
For non-technical GDR-esque trips having more stuff on the bike can make sense, but for techy riding especially with a lot of hike-a-bike I like having some of the gear on my back. I'll setup my bike differently based on what the terrain is going to be like.
A backpack doesn't bother me [I keep the weight in check] and like you I can't fit everything I need in my bike bags. I tried fork mounted cages and didn't like that setup. Having a narrow bike is more important to me than getting stuff off my back.
If you do want to carry less [on your back, bike or wherever] it's worth looking at what other people are bikepacking with and seeing if you can learn from the leaner setups. My gear has become more streamlined over the years for sure. I carry less than many people, but there are still a lot of folks with lighter/more compact setups. That's okay!