I'd definitely do 100+ plants at once if I had the money to get the lights, but I only have 2 150w led and 1 300w bar light, and 7 plants probably already to many for that
It isn't about plant count
It's about making it easy for yourself, maximizing efficiency and creating the best product you can.
Once you dial one thing in, all the other things need to be aligned with each other to reach optimal yield.
By things I mean amount of light, watering /feeding frequency, humidity and temp control, fresh air and or co2, and strain/training/timing. There are alot of variables and each one effects one another all the way down to the medium and water used.
There is always more to learn and the best thing you can do is keep an open mind and just get a good plan of how you want to grow each time and improve certain things each time to make it easier for yourself while producing more and making a better overall product.
Alot of questions get answered each grow as well as new questions forming it is a great hobby!