The problem with your argument is only "Low Tier Arena Players" are the ones complaining about Speed Teams.
The "High Tier Arena Players" are the ones complaining about Tank/Stall Teams.
The Arena Meta is Anti-Speed.
Players have heros such as:
Hegemon - Who has a passives that bypass the speed mechanic.
Tormin - Who has a passive that Freeze teams if they try to Turn Meter Fill.
Duchess - Who has a passive that reduces Enemy Icoming Damage.
The List goes on and on
In addition, The game released Gear Sets + Acccessories.
Swift Parry - 50% Chance to do Unkillable Buff I.E 50% Chance you never die.
Reaction Accessories - 25% Chance to Reduce your chances of the enemy Critical Hitting you if your team hasn't had a turn first.
All these things overlap to the point that having a "Speed Team" isn't best.
The Meta (Most Effective Tactics Availabile) is to have Non-Speed Team.
Non-Speed Fights are not enjoyable.
Every fight last upwards of 30 mins or longer.
Speed Fights happen fast.
I.E - you win or lose in seconds.
You can use 10 Arena Tokens in 5 mins vs. 5 hours.
Everything you say goes against what High Level Players want for Arena.
RNG 30 min fights - It's all utter trash.