Hey guys, I think there is a debate for sure on how to find the right mix between rising the reward for creators and platforms taking a cut to boost their development. I think mainstreaming Dapps would be the best for the whole steem ecosystem as it will bring more curators, hence more rewards. As someone said in the comments here, the question would then be: will the reward pool be large enough to reward larger audiences? Probably not and that's why SMTs are coming up (hopefully as soon as possible).
About curation rewards I think it is wrong to view it as a "commission" stolen from creators, it is on the contrary one of the main features of the steem vision i.e to reward the community for their work of detecting and "flagging" the quality content for others. To me this vision aims at establishing a new paradigm to the targeted advertising business where users personal data is indeed stolen to make massive profits for the GAFAM.
Finally about DTube, there is a misunderstanding here which is too bad as most of the article focuses on it (even though as you said it is just an example).  DTube does not take the beneficiary reward anymore, in fact it takes the cut but redistribute it to curators which was a move to test a new redistribution scheme in order to attract more curators hence more voting power to the benefit of creators, all the details are in DTube last post: https://steemit.com/dtube/@dtube/curation-and-economic-update