I was always suppoting difficulties in PvE.
The only way PvE reflects your roster is enemy scalling - too bad. Players goal should be to to get better so game is easier - sure, PvP should match you with similar opponents, but PvE?
I will be totaly honest - i dont like your idea. The biggest problem i see is the 5* as a reward. 5s are OP and should stay in LTs/special events (civil war etc.). DEVs also claimed 5 should remain unique so they wont be as reward.
I also dont like the idea of
enemies.
What i would prefer are those difficulties and their pros/cons.
Easy - enemies with 20-80 level. 75% ISO and point penalty (so, instead of getting f.e. 500ISO and 400pts from node, you would get 375ISO and 300Pts instead)
Normal - enemies with 60-150 level. 100% ISO and Pts reward (same as now)
Hard - enemies with 120-200 level. 150% ISO and 125% pts reward.
Nightmare - enemies with 200-400 level. 200% ISO and 150% pts reward.
With this we could get some additional tiers above 25CP in progress loot.
I prefer this because:
difficulty is optional - you can choose easy mission with powerful roster, kill everything super fast, but with a little penalty OR you can butcher your roster (all 100 covers i have could finally become useful
) to get more ISO and points for additional progress reward and better chances in placement table.
ISO bonus reflect the need of players - easy difficulty is mostly for players with 2* roster. On the other side, players on 3* → 4* transition could try hard or even nightmare difficulty for decent ISO injection…
How about, merge all position awards into progression, and keep scaling as is just now, but instead of being the same score per node for everyone, the score is based on the total levels/HP of the enemy team, encouraging roster levelling as those with big rosters need less goes to reach those big prizes.
I vote yes for star difficulty (or any other similar idea).
I vote strongly against removing time slices. Keep in mind there are players all around the world and introduction of timeslices options (cca 2 years ago if I remember well) was one of the best changes to the game I experienced.