This is a sidebar … but, we could easily create controversial decisions pages for every aspect of OSM, software or not! I always thought it was unfair, but now especially I find continued use of that page unhelpful, as we have quite different management of iD since the time of its origination.
More to the point, yes, issues around iD led to the SDRP. I don’t believe the SDRP has ever been evoked. That doesn’t mean it doesn’t have a job to do – I think knowing there is an ultimate arbiter is helpful for resolution of issues before they escalate.