Am I claiming entering the stream? - the question is wrong! 'Stream entrant' is yet another 'sakkaya-ditti' a false view of the five aggregates- a person that doesn't really exist. In any case you know as well as I do that I don't plan to get into that discussion
My problem with vipassana jhana is that it does not feature in the Buddhas classificatory system (not ruling out equivalent mental states though). I also do feel the 'run-of-the-mill' type jhana also provide some fantastic returns and is well worth developing. The development of the mind/samadhi (adhi-citta training) is an important part of the path, arguably more important, the higher you go. So it is neglected at one's peril. Also, if we consider the noble eightfold path as 8 areas of practice (rather than containing results of practice), then concentration needs to be practiced in it's own right, apart from satipattana practice. This is in line with other suttas which outline the importance of samatha and vipassana practice.