Why are so many people against Arena in Swtor?

I will make a analogy , when it comes to sports there is boxing 1 vs 1 then there's football 11 vs 11 these are just some of the examples the list could go on forever with the different sports that have their own set of rules etc etc , the point is they're different sports but sports nonetheless , the spirit of competition expressed in different ways.

In my opinion it's the same with pvp duels arena wz's world pvp it's all pvp.

Player versus player , is basically in my eyes any form interaction between players in which the opposing team or player can lose , but ofc we all have different definitions and views of things I'm not saying my view is better , just sharing how I see this from my perspective.

I also like the thrill of uninterupted combat. (pvp in vacuum)

So I had an idea - why not allow friendly GROUP dueling? So up to 4 people vs. up to 4 others. No reward, just fun. It would be a great way to test out new techniques and teamwork for warzones.

It would be better than nothing at all.

Learn to use apostrophes Sir. Arenas aren't dueling, they are structured deathmatches. Every class in the game has some sort of synergy with another class, which can be used to their advantage in a small scale PVP setting.
1v1 is dueling, as per the definition.

A prearranged, formal combat between two persons, usually fought to settle a point of honor.

Arena is not dueling.

There is such thing as Tatooine Ourlaws Den. People that preach about how they love small scale balanced pvp with friends (totally not for rewards!) for some reason forget about it each time.

This. Also as I saw from Blizzard, they had such a hard time trying to make PvE and PvP balanced with Arenas implemented that it was causing chaos between PvPers and PvEers with nerfs/buff demands that it got out of control.