My point is, neither of these were on the warrant list, goes to show how slick PennDOT really is when it comes to their signal enthusiasts.
With all due respect, you can't give hobbyists that much credit...a DOT's job is not preservation of an item that costs about $1000, it's to replace a potentially faulty item that might lead to a lawsuit due to failure, or eliminate one that doesn't meet the latest safety criteria. DOTs just contract-buy a few thousand assemblies, and replace them as the old ones near their serviceable end-of-life according to some spreadsheet.
There's no conspiracy to bother a few hundred enthusiasts, and they also have no obligation to notify the public beforehand, unless it's going to involve a major detour for a long period of time.
Yes, this all means we sometimes go out of our way to visit a road that's under construction, can't clinch a route because of an accident / detour, miss that old sign that's been replaced / damaged / stolen, or an attraction is closed down or not operational that day. Not everything runs on schedule, not all changes require fanfare, and sometimes an anagram of "THIS HAPPENS" is the order of the day.
Welcome to the (or any) hobby...there's upsides and downsides, and that's the way it goes.