Let me tell you now that BTEC Extended Diplomas are not soft core, nor any easier than that of A-Levels. I recently studied both a Level 2 First Diploma and Level 3 National Diploma in performing arts Acting.
Granted the Level 2 was soft core as it only equates to GCSE level. The Level 3 on the other hand pushed me in my subject area like A- Levels simply couldn't. I learnt all aspects of my body, voice and mind. I learnt about eighteen hours per week of acting technique also. It was highly vocational and to the extent that I found myself doing around 22 hours per week studying drama, business and historical context, at college alone.
Outside of college I also studied elocution lessons and speech therapy as well as yoga in order to better myself in my subject area - just like revising for A-Levels. We also had to revise for exams known as LAMDA Exams (London Academy of Music and Performing Arts), in order to gain more UCAS points. I also had to study outside of college for a full term in order to gain my Level 2 in Stage Combat - another desirable certificate in performing arts. All of this accumulated to over 10 hours worth of study per week.
On top of all this, written assignments had to be completed throughout the course - 18 assignments for 18 units, each at 15,000 - 20,000 words, research excluded. This took time to complete also.
Then don't forget, that in drama, you need to learn lines, accents, sometimes physical embodiments( especially with physical theatre; Grotowski, etc'). All of this takes time.
in the end, I found myself committing on average over forty hours per week of study which easily competes with A- Levels. Then, when it is all based in the same subject area, you can grow tired and stressed even more so. Don't forget that acting demands talent as well as knowledge too - which A-Levels only seem to focus on!
So what I gather is, some BTECs are easier but there are some that demand a hell of a lot more from you than A-Levels. As a result, top schools that cater for drama like RADA, LAMDA, CSSD, Bristol Old Vic, etc' prefer BTECs . I can see this being the way with many more subject areas.
BTECs are not a walk in the park! It took me hours upon hours of intense work to achieve D*D*D - the second best grade. Shows you that not everyone achieves that elite D*D*D*.