I don’t actually think the skill chip availability needs to be hugely increased. Maybe like 10 instead of 7 per hero per battle would be nice, but I think that would be enough.
The biggest problem I’ve found as an active f2p player is, by far, hero chips. Diamond Crates aren’t nearly as available as they once were without spending (remember the period we’d get hundreds & thousands in events or contest rewards?!), and 3* heroes are a thing of the past, thus amassing a large amount of excess hero chips for 15 specific heroes - a coli roster - is very difficult. Not to mention that they need to be used for mods too, and also memories for disks.
If the skill chip reward was increased from 7 to 10 and an additional method of acquiring hero chips was introduced, it would be significantly easier to progress red skills.
I’ve always said that the mechanic of “has a chance to fail above X level” has no place in these skills because of their difficulty to level up, but that doesn’t seem to ever be changing