Steve,
I really have to do a small video of chip-bud grafting so we can confirm that we are talking about the same technique :-)
How can 2 simple cuts in the scion and in the understock be harder to do, for a beginner, than removing a bud, minus the wood, and inserting it under the bark (that you have to loosen first) without tearing it appart. The number of steps in your tutorial and the warnings on how to avoid tearing the bark, shows that it's not that simple for a beginner.
When i do my chip-buds i barely scrape the understock to create the slot for the scion chip. So there's not any hardwood cutting to do (specially in this time of the year, when the wood is greener) so making the 2 cuts is a breeze.
In close quarters or with thinner stock i usually use only the tip of the knife to make the slot in the stock, so not much room is needed. But, in really close quarters and with miniature buds, t-budding might got an edge (but i haven't come across that situation in figs, though)
Regarding the difference in size between scion and stock. You really have a point. It can be done, but we shouldn't select a stock that is 3 or 4 times wider than the scion (usually not a problem with figs if you are using green wood) but, on the other hand, try inserting a bud under the bark of a stock of the same diameter as the scion, without it tearing the bark appart (not a problem with chip-budding, not that easy with t-budding). It can be done, but it usually ends up looking like someone is using clothes from his younger brother :-)
Kidding aside...
I used T-budding a lot before i began exploring Chip-budding. Now, i use it less and i prefer the simplicity of Chip-budding, except for those fruit types where it really shows a greater percentage of success (not that many in my experience).
Regarding beginners and fig grafting, there's no harm in learning both techniques, but if we agree that T-budding can only be used for figs with green scion and with the bark slipping, why make beginners learn 2 techniques when they can get away with only one for almost all fig grafting situations? If Chip-budding was difficult to do i would agree with trying T-budding first, but it couldn't be simpler.
Anyway, i learned and use almost all grafting techniques and i encourage everyone to try them for themselves. So, try T-Budding and Chip-Budding and draw your own conclusions.
Remember that, what works for someone else, might not work for us and vice-versa. I never forget that, if i followed some recommendations, i would never had tried Whip and Tongue for figs, but i did, and i can now say that it's my most successful technique.