Such as mouthpiece would not need anything to be inserted into the chamber, which is a problematic design decision.
Howdy Cosmic Dude! You must not of owned one of the most popular vaporizers on this forum and is probably one of the top selling portables ever made, the Solo is designed as such and IMO is anything but a problematic design. Hopefully I can share a few tricks from my Solo/log days that may make your F2 a little more enjoyable with the glass accessories.
I'm a flavor whore so I pull the stems out after every hit so my product doesn't continue to cook, this also aids in effeciency, so I never forget to pull out before she cools off.
I also load my stems by sucking herb into the bowl like a straw, so the heat from back to back sessions doesn't affect my good time.
Some log stems come with a 3/4-1" piece of silicone on them which you can place around the stem to keep the hot end off say a table when laying hot stems down.
You'll also find that your spent load taps out very easy, and almost puck like when all the moisture is vaped out.
Hope this helps in your experience as well.