Shelby,
I've followed your posts on your backpack kit with some interest. I used to do a lot of backpacking, climbing, etc., but it's mostly not my M.O. these days. But I've been eyeing a couple of trips for this next spring if certain things fall into place, so I appreciate your dilemma: weight and size vs. image quality and usability.
Tilt/shift is a very handy tool for landscape, but this also depends on one's photographic style, at least part of the time. Many stunning images can (of course) be made without it. With medium format the shallower DoF definitely is a challenge, but with practice and careful consideration one can achieve more favorable results than what might first be apparent in one's early efforts of using MF. As Jack mentions, it's not nearly so rough as 4x5 or larger.
Using Helicon Focus is an option, and maybe even a requirement for some images without the use of movements, but using it adds another element to the process that one needs to consider. Jack mentions the concerns of subject movement from frame to frame, and this can be very real in landscape work. Getting things to settle down (or more accurately, waiting and praying for breezes to stop) can be enough of a concern. What isn't mentioned very often with regard to Helicon is the personal feelings about the process. For me, shooting landscape loses a great deal when shooting for use with Helicon. I'm referring to the personal experience and feeling while shooting. This is why I say one needs to look at it beyond the idea of simply "can it work". For product type work it doesn't feel bad (or good) to me, it's simply a tool to record the item favorably.
I wrestle with the use of Helicon because the capture process sucks to me and the assemblage process feels counter to what I derive joy from: a single capture (other than the occasional pano), carefully composed, requiring no crop and minimal post (beyond traditional darkroom-type). (I'm definitely not suggesting that I always achieve that, but that's my goal and what makes me happy with an image.) Of course, many others feel quite the opposite about Helicon or HDR, etc, and that's great too. I suspect that the process of shooting for Helicon or HDR is what some people enjoy. There is no "correct" way for this. But I mention it in case one was to invest in a process because they're told it is possible, only to find out they lose some personal enjoyment from the process.
We're fortunate that we have so many options, and the beautiful work shared here and elsewhere shows that there are many ways to skin the cat. And those options make our outfitting process all the more complicated as we find our own personal paths.