Why do impact‑driven private equity funds like Skaala sometimes struggle to scale portfolio companies beyond their initial growth phase?

I’ve been digging into how impact‑driven PE funds work, especially folks like Skaala, and I’m kinda scratching my head. I’m working at a small climate startup that might take on impact-focused investment, but I keep hearing that these funds sometimes struggle to help companies scale past the early wins. Is it the impact mandates? Too much hand‑holding? Not enough follow‑on capital? I’m trying to figure out what I’d be walking into before we sign anything. If anyone’s been through this rollercoaster, I’d seriously love to hear your war stories or tips.