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I don’t think this is a fair point. Every developer makes “opinionated” decisions on default settings on a daily basis. SourceHut is open source and anyone can propose a patch that makes the tab width configurable, which to my knowledge has not happened. “Forcing their preferences” would imo imply that this discussion happened and the patch was rejected without good reason.
To me, this sounds a lot like the usual “I don’t like the how this thing that you provide for me for free is doing this one thing so I demand you change it for me free of charge” argument.