well take a look at Iain Abernethy, as he is analyzing (bunkai) the TSD form called
Kong Sang Koon, aka Shotokan's
Kusanku.
He lays out the rationale for the movements.
This is a 3rd dan(or higher) tsd form, in Chuck's fighting art [which blends bjj and tsd.] it is a 3rd dan form.
There is a lot being unpacked. But there is cohesive system here. Now, typically the bunkai isn't fully disclosed so openly, this fast.
Usually a good amount of time is spent mastering the movements of the form.(solo form) and the student breaks the movements into chunks, and create partner drills (one step sparring) with progressive escalating resistance.
but the honto bunkai... or canonical/official analysis and meaning of a 3rd dan form would be typically disclosed at 5th or perhaps even 6th.
Part of the problem is too many people were rushed through to instructor grades and sent out to plant schools before ever receiving the deeper things of blackbelt forms... so stuff gets lost and falls out of the curriculum.
(mainly talking about WW2 and Korean war era US Serviceman geting 18 month BBs, znd being sent back stateside to open dojos, and perpetuate the art.
eventually, people have a shallow understanding of a form at best.