Here is my personal experience playing on this server. I started around a year ago and currently have more than 1,500 hours in the game. I started with FOney and when I reached ultimate, I noticed that Forces in this game do not work like in other games. I thought that perhaps playing FO was using magic and heal only, so I did that for a period. It was not until I played with more experienced players that they told me that I should get Magical Piece and a few weapons because Forces don't play like other games. All I did was resta and spam magic based on enemy weakness. What I found is that I wanted to contribute more to the party, so I started using SoF, Bringers Rifle, and more Force weapons offensively. My experience tells me that using FO offensively worked out better than just heal the party, spam magic and let the other team to kill the enemies. One of the reasons for this is that if I have to use resta everytime before a bunch of enemies spawn then sometimes I do not have time to prepare my positioning for example to demons big enemies and contribute to the party.
So far I only came one game in MAE GDV that a HU asked an FO to please not Resta to be able to kill Mericarols fasters, and before he explained the concept of DF, the other player left mad. In most games that I have been in the last year, the party do not have any problems because they communicate in the beginning if the HU is using DF and they don't seem to have a problem not using resta.
Having stress in casual PSO i think it's a matter of perspective. I currently use DF on my HUcast and don't mind people using resta. In particular, my DF has 100hit that I should be using only that weapon, but I mostly uses other weapons because I noticed that you need a lot of knowledge in spawns to be able to use it efficiently. I don't want to be constantly dying and making the FO to revive me.
That is why it's out of place. Because of zero death XP penalty and very little inconvenience from death, there's no reason NOT to use it.
This is one of the reason PSO is relaxing, that there is no penalty (Well, there is one based on how much time you have in the day to play. If you keep dying then it is less time for hunting the item you want). Adding an extra penalty for dying would actually make the game stressful.
This is why I think the gameplay is more stressful when a DF user is imposing on others.
I don't think this is true for most people. If a DF player knows the spawns, then they can quick kill for example Baranz and help the other players not die, (especially the force) with the missile attack, otherwise, the FO would be spamming resta to try to protect the team. This will make the party less stressed because they don't need to worry about that Baranz attacks. There are many more similar situations.
I think DF low HP gameplay is disruptive because it's the only weapon in the game with that requirement and it decreases playstyle options for others.
I think this is your perspective. For example, I could say the same thing with rangers.
"I think Rangers with v502 and hell weapons makes the gameplay in ep2 disruptive because before I can attack with my HU a target, it is already dead. Meaning that it decreases playstyle options for others that are not rangers with v502 and hell weapons."