Just some logical extrapolation based on facts so far.
The down side is that at the current rate, this game will take nearly twice as long (1% most releases, so let's say 90 releases, at 24 releases per year, it's a little under 4 years) to finish compared to previous NLT games (1-3% per releases, so let's say roughly 50 releases, at 24 releases per year, it's a little over 2 years.)
Now here's the opinion part.
I'd take faster story progress over voice acting any day, all the time. And I'm sure I'm not the only one feeling that way.
And while we are stating opinions, I've mentioned this about the last 2 NLT games already but this one applies even more to this game. The cast is too big. The cast in both ToN and TGO can both be halved with only very minor impact to the overall story. As both games were, they both have sprawling casts with very shallow personalities.
With 10 main LI + 6 side girls in SotS, this is shaping up to be even worse.