I tend to agree with you. Buying a 12k phone you do not expect to have to switch off some of the main features that actually 'makes' the phone what it is, in order to prolong your battery use.
I think the S6 is a Samsung blunder, probably its worst blunder to date for high-end phones.
I also agree, people who committed to a 12k phone would probably not like to go around saying they bought the phone and had to deactivate most of its core functions to keep the phone alive. This is an embarrassment to users and most of all to Samsung as well.
I was a Samsung fan and had the S3, S4, S5, Note 3, Note 4, Note Edge and now the S6. I hate the S6 with everything within me and cannot wait to get rid of it.