Simple Delivery works perfectly for me.
I'd like to know how your "online research" shows it doesn't work for the majority, vast or otherwise. It is extremely rare for anything positive about e-Bay to be said in these fora. Have you ever seen a Buyer open a thread saying that they bought something for a decent price, it arrived safely and on time, was as described and they are very happy with their purchase yet such things happen thousands of times a day, as do similar things from the Seller's side. Likewise people are much more likely to take to social media to moan than praise.
Of course Simple Delivery doesn't work for everybody but for some of us it's an improvement. I don't pretend to know the proportion of people who like, hate or are indifferent to it — just that the complainers are, as normal, voicing their opinion the loudest.
The only way of knowing what the majority feel is to ask everyone and force them to answer — again people are more inclined to complete surveys if they are unhappy than if they are satisfied or better. e-Bay will know if it's adversely effecting their business and make changes if it is, as they already have.
If you've been on e-Bay for over twenty years you'll recall the howls of anguish over things like Sellers not being able to leave negative feedback for Buyers, e-Bay taking a cut or the P&P charge, the introduction of Managed Payments and other things beside. Despite these all being "The end of e-Bay" and "Sellers leaving in droves" it's still here and those things are hardly complained about today.
Cacas vendit.
