I think one of the issues is the vast diversity of motivations for smoking or vaping. Everyone takes something a little different out of the experience and frequently it can be subtle enough that we aren't aware of it all.
Because of that, there is quite a bit of trial and error involved in finding something that can truly replace smoking. That might be a hassle that many just don't want to deal with.
I vaped on and off since it came to market, but it wasn't until I found subohm that I actually quit. I was never really a dual user, I just kept switching back and forth.
With cigarettes, all of these things are wrapped up in a single product. With vaping, the variables are massive and what works for some may be terrible for another. That makes giving advice difficult and even detrimental.
However, trying to change this might remove a lot of that customization. Its tricky..
As mentioned though, I think the one unifying factor is the desire and choice to actually quit smoking. If we were able to educate and motivate those willing to quit to actively explore all facets, I think the success rate would increase. The problem is that costs increase too..
Perhaps some kind of starter kit could be designed. Modern regulated mods can meet a vast majority of needs, but then it might also include a few different types of atomizers (mtl, tank, and dripper maybe) with both premade coilheads and rebuildable options. Perhaps the mod itself could even be configured to be a tube or box while retaining regulation and OLED display.
Then, perhaps include a dozen or so different types of coils that range from low ohm (~0.1) to well over 1 ohm, as well as a variety of wrap sizes (both ID and wrap count), and several different styles (single, twisted, parallel, clapton, alien, etc.).
The idea would be to include "one of everything" so that the customer can try everything the market has to offer with a single purchase. Some starter kits do something similar, but I think it could be significantly more extensive.
It wouldnt reduce tinkering, or be some silver bullet, but it could be something to build on when it comes to increasing cessation success rates. The hard part would be keeping cost competitive, but perhaps the kit could be comprised of something like FT atomizer clones bought in bulk.