With some apologies for my snarkiness, it's a bit straining for me to read this well-beaten rhetoric.
With the latest proposed rules revisions, the governing bodies have made it clear that Bunkers remain a special case in terms of golf and their rules and place are integral to the game.
Consider:
1. The vast majority of golf courses are located in areas where naturally exposed sand does not occur. As such, to codify the existence of a bunker and define it (more on this later) shows that these areas shall not be treated as other areas.
2. The Bunker is the second most-defined area in golf (after the hole, and more deeply defined than teeing ground and putting green). The Rules of Golf read with a reluctance as to the maintenance and setup of a golf course. Yet, the bunker is specifically a hollowed-out area where the ground is replaced with sand or the like. That is a borderline construction parameter.
3. The proposed 2019 revisions eliminate the word "Hazard" from the rule book, and also more clearly define the areas that are presently treated as hazards as areas where a ball is likely to be lost. This pertains to Bunkers in the sense that the rhetorical hazard that is the Bunker is much clearly. Presently, Bunkers are not Hazards as the rules go. These are two different areas with two different sets of privileges bestowed upon the player as far as play goes. The proposed revisions, thankfully, further segregate these areas by allowing the player to either find and play the ball in the"Penalty Area" as though from the "General Area" or drop under rules similar to those found for both types of "Hazards." This has the far reaching consequence of potentially softening the potential Lost Ball penalty (again, see the proposed definition for Penalty Area) and also further separates Bunkers from other parts of the golf course.
4. With the three items above, it is therefore obvious that bunkers are both strictly defined areas that are considered different from other parts of the golf course.
To codify Bunkers as an area where the player may improve the lie to their desire would not only codify boorish and irresponsible golfer behavior, but also further serve to segregate the better player from the worse. The pace of play argument is a canard because play will be delayed just as much by the golfer improving the lie (if not more).
Give me the ability to improve my lie in the sand at a place like Tobacco Road and I lose all fear of the golf course. I ignore this so-called local rule when I play there.