Don't take a quote, out of context, and ask a question that's already been answered in the full context. I've given an opinion, admitted as much, stated reasons and speculated. Beyond that, statements like "totally depends on the network", come with a nearly endless set of variables. There's no point in debating minutia - there are rules and exceptions in nearly any topic.
Windows has roughly 85% of the market desktop/laptop share, with WinXP being roughly 4% of the market. (That's amazing in itself.) With 10's of thousands of OMV users, even 4% of the overall number represents a large number of clients that need support.
With that noted, I wouldn't even propose to be an arbiter, telling Admin's what I think they need (LMB or other), in support of old clients and expensive peripherals. What they do, how they do it, and why, would be their choice.
Really, there's no debate here.
There are two basic questions. First, is LMB harmful when not needed. That feeds into the second question of whether (or not) the LMB toggle switch should exist. With opinions given, that decision is @votdevs