In my PvP circle, the main reason to stealth and flag someone is because of the mechanics of the personal teleporter. If one of Kane's ideas such as a delay was put in place, there would be less reason to for a group to sneak up on those champing.
As for manipulating grey status, in order to incite an attack and avoid getting a murder count (or tricking someone into going grey for the same reason), this has been an issue with UO since the beginning. I'm all for brainstorming about it, but after 16 years of this being observed and complained about, I'm not aware of anywhere that has the solution for dealing with it in a Felucca setting.
Nothing says the players that keep getting ported away on have to stay in that area for it to happen again and again. They are simply hoping that the player slips up and catches that person, which happens more often then not. This falls into the leave on your own mentality.
This may hold true for playing cat and mouse at a moongate with PKs, but with moongates everywhere on Evo, it causes issues elsewhere. For instance, a group at a champ near a moongate. Let us say the one inside Destard. Player A runs into the champ with 5-10 donation pets set in guard mode and is attacked one way or another and pets go on the offensive. Player A takes some damage and hits the "oh @#$% macro" and teleports back to the moongate a few screens away from the champ. Getpet, and run right back in. Rinse and repeat, allowing Player A to severely harass those doing the champ, but with little chance for them to do anything meaningful to stop it.
there is nothing to counter magery and eval.
I want to briefly address this idea as well. This is a patently untrue statement. Especially on a server with spell channeling, no skill cap, and all sorts of other mechanics. If the idea that a player wants to stand next to another player and swing their weapon,
and that is it, is the definition of a dexxer, then that will
always be a weak play-style. Even more so on a no cap server.
Also, as an example of the over-dramatization of evaluating intelligence's importance, Soulsunder has been running around with 155 eval int. He has dueled players with in excess of 200 eval int on numerous occasions and came away the victor. Yes, the skill raises your damage and that is helpful, but it is not everything.
Edit:
And going in the direction of extreme melee damage has been tried with the addition of the samurai sword. My recollection is a good many people did not care for the damage output of such a weapon.