Low power, high ranked teams with a good speed lead, a dec defense and a nuker are going to be fast. So I would put in a slow, tanky, high resist team, survive their attack, rez my team and wreck em. Or I would A1 their fastest champ with Hegemon, then Arbiter boost and provoke lockout with Maulie or Umbral.
Very high power, very high ranked teams with defensive champs will be slow and resist everything. So I put in a Yoshi to increase accuracy, strip them with Serris, and wreck em. Or, if Tormin, let Dark Elhain just do her thing and wreck with every freeze.
Like I said above, if you make Speed and Resistance weighted the same, you take away my ability to assess which teams do what. How do I tell a fast Siphi from a high resistance Siphi if their power is both 60k? The answer is, I don't.
What you are asking for would make arena more difficult, at least for people who have worked to learn the different arena strats and team compositions, and how to combat them with our own team changes.