There's more to row2seat2's post than just the current "unremovable flagsticks" bug. To me, the most glaring omission is that WGT does not give an option matching "... or held up to indicate the position of the hole". This would often be useful on blind shots when it becomes necessary to move the aiming triangle. The rule could be implemented fairly easily by adding a feature to the existing (in/removed or shown/hidden) flagstick toggle control. This would make it in-removed-held up when off the green or shown-hidden-held up when on the green (though I'm not aware of any greens where it would be especially useful to have the flag held up for putting, the rule does allow it). The "held up" position would simply move the flagstick straight upward 7 feet or so.
WGT could even implement a version of this which fits the spirit of the rule but is better than real life: instead of merely raising the flagstick, they could change its "draw priority" so it is drawn last, on top of everything else. This would give a sort of "x-ray vision" quality, so the flag could be seen even when in reality it would be hidden behind terrain, trees, or any other obstacle (regardless of whether someone is holding it up).
However, there are already other obscure and not-so-obscure points in the Rules of Golf which WGT have chosen not to implement, some of which are arguably more important to the game (unplayable lies, drop options, marking ball positions on the green, order of play, occasionally being able to play a ball out of a water hazard, etc.). So, I don't expect WGT to put any effort into fully honoring this rule any time soon.