No, it can charge while playing when using the official adapter. It's just that people were using low-rated battery packs. USB C can support up to 100W, the Switch charger is 45W, so if you're using a pack that doesn't output more than 10-20% of that, obviously you'll have slow charging and probably not enough to sustain playing and charging simultaneously. I'm not worried, I'm almost never away from power for more than 3 hours anyhow, though I will be finding a high capacity battery that can output a good enough charge rate.