BTECs have been around in various guises for years, and I mean YEARS - what is now BTEC Level 3 used to be an ONC back in the 1950s.
Back then an apprentice aged 14-15 would go to college one day a week for either City and Guilds or BEC/TEC (before they were combined into BTEC)
There are a number of reasons schools / colleges like BTECs, for me it is the freedom to teach in different ways and assess not using exams. I teach BTEC level 3 Health and Social Care - most students go on to be nurses with a few doing ODP or other health related jobs.
BTECs will not get you on to a medicine degree but IMHO will prepare you better for nursing than A Levels mainly because there are so many units that cover so many practical aspects.
An example - when looking at infection control as well as looking at bacteria / viruses / fungi we also cover correct handwashing, how to use protective equipment and a practical which includes students handing out drinks to the class, but before handing them out we paint the hands with facepaint (which is not toxic if swallowed) it shows how normally invisible substances pass from one person's hand to plastic cups to the recipient's mouth.
There will be written work to accopany it, but as a teacher you can add video evidence and utilise skills the students have from outside the school enviroment and you can cross reference work from one unit to another.
Another example
A student produced a menu of a balanced meal with a couple of options for the nutrition unit, but then translated it into Xhosa w so it could be cross referenced tot he communication unit.
IMHO - if your child is easily capable of 10 GCSEs A* - B then they should be doing GCSEs only.
If your child is C/D grade - then stick to GCSE English, Maths, double Science and one other - no employer asks for more than 5 A-C grades - then fill up the timetable with things they enjoy. It is better to have 5 C grades than 10 E grades. Obviously if they are capable of double science, if not then do at least one science.
If your child thrives on coursework or more creative work then fill the time table with a BTEC.