In this question, the most highly voted answer mentions that
Note, though, that on-glide and off-glide are also sometimes used to refer to the beginning and end of any sound, not necessarily a vowel, such as the approach and release phases of a plosive.
I'm quite happy to have these terms generalized from only plosives, but am still somewhat unsure about their exact usage. The default, linguistics 101 model of speech production is obviously
phone phone phone .... So, using these terms, it might be (in terms of articulation only)
on-glide main-articulation off-glide on-glide main-articulation off-glide ....
This would seem to suggest one would subsume the transition period between phones into a combination of
off-glide1 on-glide2. This doesn't seem quite satisfying to me, and I'm not sure in how much what I wrote represents a mainstream view, a fringe view, or just nonsense.
So: Is there an explicit name for any transition period between the articulation of phones, and if so, how does it relate to on-glide and off-glide? And what happens (in either view) when a phone seems to involve almost no transition (e.g. homorganic fricative → stop)?