Yes I agree, so I guess I disagree with the idea of a "data lock". I do however, recognize the desire for a "data lock" which arises out of a personal frustration with good-faith Wikidata editor behavior. Many of these unnecessary edits & subsequent reversions on Wikidata could be avoided when a warning is sent to the good faith editor who makes the same mistake for the nth time. We should be investigating ways to build tooling to address this issue, as I believe a lot of the mistakes are caused by Wikidata beginners who don't understand Wikidata. Don't forget, the matters are complicated by the fact that most editors don't speak a common language except for the labels on the items and properties they are "edit warring" over. I expect that eventually the need for this will decrease as the number of wikipedians in all language versions slowly get onboarded in the proper use of Wikidata.