The workshops are very easy to get into at BUTI. The ensembles are much more competitive. That’s the difference. Students attending the ensembles for the first time…often suggested they do the workshops first.
I still say…just have your kid list these as activities. The adcoms will figure it out. And I disagree with your comment about CA schools not getting applications from kids with active music ECs. Plenty of kids have these ECs.
I honestly believe that BUTI and Interlochen will be recognizable by adcoms.
And I also think you are overestimating how this will affect admissions for a student who doesn’t plan to major in music.
Bottom line, is both Interlochen and BUTI will show a commitment to music in the summer.