Hey,
I'm personally convinced too, that a long form doc is not only possible, but also made easier now when using Resolve...
You may sometimes adapt your usual workflow, for ex. the way you organize timelines, the number of them you make for one specific segment of your doc, and consequently the way you gather clips and content on your HDs.
But overall, I think everything's out there to make it painlessly...
The 1st time I tried, I was a bit scared or concerned too, but at the end of the day I didn't have all the tools we can rely on these days, because this very first attempt was on... Resolve 14
Putting aside the huge upgrades of the GUI and what's behind the curtain, I managed to make it happen by making several projects to be sure I wouldn't have issues with mixed framerates. Now it's just a question of timelines !
I already had clips coming from everywhere, multicam sequences for ITWs etc etc, a lot of things which are so easier to deal with now.
What remains from these - not so ancient - ages ?
In ANY project, whatever I ingest in Resolve is yet ProRes. This didn't and won't change for me. Still, since I'm also a hard Fusioneer, plus Nuke and Motion and Mocha Pro user, I still don't really try to involve ReFusion for more than a basic quick trick : whatever graphics, VFX or CG involved are made on external standalone versions and grabbed into Resolve after export. I know I could try to make it a little more in Refusion but relying on this kind of habit doesn't bother me.
The only thing I can't really answer is the audio part : whenever a lot of tracks are involved in a long term, it's made outside and given to me later on. AAF or XML to co-workers and done, I just wait for them to come back
35 mn was the longest project I made on my own in Fairlight, with just a few Izotope and ERA inside but hey, I admit it's a real job... which is not really mine up to now.
Finally I'm convinced it's all about complexity of the project, more than the numbers of hours of footage, because if it's all the same kind of content/clips profile, we have everything we need with metadata, power bins, galleries, to treat it with efficiency imho...
It's been a while I'm not scared anymore to start huge projects not on my good old FCP 7