I don't think the 4 player system is a positive change. There are some runs that scale stats based on the amount of players, and the challenge makes it fun. East is already pretty empty, but if we can fill 4 spots, there will be less need for more players. 8 player raids means more diversity, more team work and coordination, more challenge in some cases, more social opportunity, and QB's allow more rewards.
Teamwork and coordination died the day s2 came out and people no longer needed to use boss mechanics like titan's balli, droping lionotus off the cliff, colru walls,etc