They have these "simple stores" as I photoed in ALL of their regions. This is not a regional decision. This is a corporate decision and there is management at corporate that oversees this "simple store" program. When corporate decided stores were going to this program there was nothing anyone could do but "go along with it."
These stores receive significantly less inventory (zero backstock), at the time in 2017 they had major staffing cuts occur (now the labor model in these isn't all that different from the other stores), in an effort to drastically cut costs and make these stores lose less money. They didn't think it would impact sales "much" since the stores were already low volume but it actually did impact sales. However they kept up with it and the associated cuts in expenses and seem to be satisfied with how the program is going. They also pay their store management less in these stores (implemented once they do a switch in store managers) as the management wages are based on store tier and these stores drop down a tier or two. They also pay current/new promote store managers SIGNIFICANTLY less than they paid store managers 15 years ago (tenured managers still get their higher salary but slowly they are retiring).
In addition to endcaps being gone they also eliminated sidecaps and various other merchandise displays. The idea here was to run these in a convenience store type fashion and just accept that there is not much foot traffic and impulse buy efforts were severely cut back. I am not saying this was a good move (It is awful and keeps getting worse- just the last dental reset they did on these stores earlier this year made it so I can't shop them because they don't carry numerous SKUs of single toothbrush/3oz toothpastes I buy with coupons there most weeks) but they seem happy with it I guess, since the program is still going.
There have been some anomalies with this program that I question the logic of- for instance a store with a high volume pharmacy but a very low volume front end will still get this "simple store" program even if it was profitable. That is an odd case and not overly common with Walgreens (this scenario is VERY common with CVS).
There is also a sort of halfway program with this on some stores where some (but really not that many) SKUs were cut, some aisles have cardboard boxes only on the bottom shelf of some sets (such as shampoo), and back facing endcaps are removed. This program was intended for lowish (but not "DIRE" low like the "Simple Stores") volume stores that they viewed as over-SKUed but still get to have backstock, etc.