6 is doable but I find i have to spend more conscious efforts ensuring everyone stays engaged. It can be easy to zone out or feel left out when 5 other people have things they want to accomplish. If you feel like you can have a good effective zero session where you talk through your thoughts on the larger group to make sure everyone is aligned it should be ok… I could imagine with 6 randos it might be a challenge, but idk, I’ve always played with friends in-person or online so take my perspective with some grains of salt :P.