I agree that oil capsules are the way to go for dosing precision and general healthiness. I like oil caps the most out of all edibles simply because you can lock in a approximate amount needed to get you medicated. Not requiring further cooking or excess calories is a bonus.
To answer your question about dosing vapor, I can give some insight as a vaping nerd.
Just to be clear I mean dry herb vaping where the raw cannabis flower is baked at a temperature hot enough to vaporize the plant oil with all the good cannabinoids but not hot enough to burn or combust the flower. This method is much cleaner than combustion smoking while avoiding the possible synthetic additives in cartridge vapes.
When it comes to vaping theres two paths users tend to head down. One common path is that you just quit combustion smoking. You miss it and want to emulate the experience of smoking as closely as possible.
Big milky vapor clouds filling your regular sized bongs and exiting your lungs in a huge rip. This path leads towards the natural conclusion of expensive ball vapes and can easily burn through zips a week. You don't care because you can afford it or grow your own.
More experienced vapor heads realize another path. It turns out you don't actually need all that much vapor to get baked, especially with good flower or basic tolerance management.
So you go for maximizing your herb efficency. Try to get every bit of vapor out of a very small amount of herb.
This is where some people start to actually care about dosing. Exactly how much vapor does .05 g worth of bud produce? Exactly how many .Xg's does it take to get you where you need to be?
This path of microdose vaping is most commonly followed by half bowl dynavap users, but there are many microdosing options.
Here are three different bowl sized.
I can't tell you exact numbers but spitballing the biggest bowl probably holds .15-.20g, the middle one holds .10g and the teeny tiny one .05gs. How these get used depends on flower quality.
If I'm vaporizing top tier ganja Its easy to get medicated and I want to stretch it out with the small or middle bowl sizes. If I'm vaporizing lots of cheap mid or shake I'm going for the big bowl.
It also somewhat depends on if I'm wanting to run the vapor through a water piece that day. The open air of the big bowl makes pulling through water much easier on the lungs.