Caveat to this though, a lot of pve people come into games designed with open world pvp etc. and those pvpers get drawn in first then the PvE people flood in demanding changes etc. and a small loud voice overrides what drew hype and attention to begin with and change the game. Case in point Black Desert, their pvp was fundamentally different then what it was now and imo better. After the changed it killed a lot of interest from the pvp crowd to begin with. Changing for pve is and find and, but when you change the original premise that drew in pvp players and kill it for them. What you get is pve players that can play pvp and pvp players looking else where. PvP players are actively looking for a game designed for them where, " care bears" dont get to dictate how they pvp. I equate it to pve players going to cod forums and getting AI shoved into matches, but they get to choose if they want to engage with players or not and the original player base has to deal with it. It's nice and all, but the original design is now fundamentally changed pissing off the original player base. The new people come and and pretty much to the OG playerbase to go elsewhere etc. harassing people for wanting what was originally promised. I've seen this shit happen A LOT in games with original design.
In the end if the company decides that's where the money is then that's where their going to go, its about profits and marketing and obviously Amazon saw a clear monetary increase by changing the overall game style.
In the end MMO's based entirely on pvp generally do not bring in as many players as games that combine the two, WoW being the biggest example, if WoW was a pvp only based game it never would have reached the milestones it did, Warhammer was a great example of an entirely pvp or rvr based game and it did really well but nowhere near the numbers of WoW. If Amazon could generate a 50% increase in product sales or subs (assuming its sub driven I think so) you can bet your sweet tits their going to make it so.
Again, I feel for the pvp crowd because this was designed to be something different originally which is why I think they could have done it differently, add in PVE but do what other games did, make PVP servers and PVE servers, the only thing I can guess is that with the overall changes maybe this wasn't doable the other problem with pvp and pve games is balance, again WoW a perfect example of NEVER being able to balance the classes, skills and gear between pve and pvp and every patch or two your class goes from being a god to a peon and vice versa.