A few points I suppose - schools now rarely provide ingredients as it would be a choice between that and support staff - or even - paper - budgets are tight.
The time constraints can be be dependent on where a schools focus is - double periods are hard to deal with for some academic subjects - so practical subjects just don’t get them - and the same may be true of internal funding - one food room 1000 students means not all food lessons are in food rooms - so availability of facilities is ltd - so Lots of students cook at once with limited equipment.
Most secondary school student are not able to / have never - washed up by hand -
used a peeler - are safe with a knife unsupervised - or are so surprised that , say, creaming butter into sugar requires physical effort,t that they complain vociferously for up to ten minutes that they cant use an electric mixer rather than just do it in the way you demonstrated to them. You can tell me that’s not the case for your child - but in a group of say 25 only two would have all those skills.
If you let them choose their own recipe you WILL be faced with a bag full of whole octopus at some point - some parents are very proud of their "foody"ness and think this is ok - oh and they wont have shown their child how to deal with it...and that’s out of your two minutes.
One of the reasons the lessons are dummed down is that kids do less cooking at home and have much lower basic skill level. Raw and unprocessed ingredient handling is rarer. ( see cant use a peeler or a knife) so they are starting at an appropriate level for their skills.
The example of when to thicken a sauce and how is open to debate - the process may well have been: research, comparison, draw conclusions , test. - so they researched one or more methods and tested one...just not the same one as in the video
I wouldn’t be a food teacher if you paid me in Gin - they are almost universally awesome