I feel like saying you think more issues will be revealed and compounded at level 5 is a reason not to put it in yet. The consensus on here and Reddit seems to pretty clearly point toward combat being pretty broken, and I agree. I don't see how adding a ton more complexity to the issue before fixing the underlying problems would help them improve the game faster. You always want to tackle these things in stages. When you're debugging code, you don't write the whole thing then try to fix it. You focus on small blocks that compound into bigger blocks. Once combat without tons of multi-actions and enhancements is working reasonably well, then you add the next layer of complexity and rebalance. Adding in the additional complexity when the foundation doesn't work doesn't just give them more issues to iron out, it increases the difficulty (and time commitment) of fixing those issues exponentially.
I say keep level 5 locked away until the basic gameplay is rock solid.
