i'm not sure what is meant by "under anarchy", but i'll assume the implication is a world without all the institutions (and related mindsets) of mass society, which currently prevent anarchy and widespread anarchistic relations.
in such a world, mass society would/could not exist. hence, humans would likely live in much smaller social groupings. in such a world, one group might be techies, while another might be primmies. i see no reason why those groups could not coexist - so long as neither imposed their will on the other.
a major practical issue with techies being one (or more) of those groups, is that most (all?) technology - as distinguished from human scale "tools" - requires systems and processes that are completely reliant on hugely destructive activities and materials (not to mention, ideologies). the resource extraction, transportation, processing, production, etc, are all things that would inherently impose on others that have very different desires.
since such a world would assumedly proceed from the current technocrapia, there would be much detritus left over that could be used by those that cared to do so - with the same understanding that imposing on other groups will cause major conflict (and go against the anarchistic desires that are supposedly shared). i personally would be with neither of those groups (techies or primmies), but at this point in my life, i would absolutely use my solar panels (and related tech) for as long as they would last.
creating new technologies would likely be limited to what is achievable by techie groups without imposing on other groups. and that is where i see anarchy falling down for them. perhaps they could find a way to work it out, with many tech groups working together, but as soon as they impose on me and mine, they will have to deal with some serious resistance. i personally think it would be impossible to retain or (re)create real technology without MASS society and all the necessary institutions that requires. and then it will have ceased to be anarchy.
[yes, a bolo'bolo -ish view. one might think - from various posts of mine - that bolo'bolo and "only a tsunami will do" are the only things i've ever read. psyche - i haven't even read them!!!!! bwaaahahahahaha]