I disagree, they have built and maintained side hustles and proven they can do it. It is just that they have yet to find monetary success. There is success in launching at all with a full time job.
I agree that if you can devote more time then definitely do though. Maybe that is going part time, or getting rid of some debt first so you can take longer breaks and focus then.
The other difference I think showing here is that a side hustle doesn't look anything like a startup. A small business doesn't even look like a startup. If you have a startup you probably have VC and employees, then of course you should quit your job.
A side project you are trying to turn into a small business can be done alone and slowly scale up. At some point in that long process you will probably need to quit your job, but that will hopefully be easy to see when you get there.
I agree that if you can devote more time then definitely do though. Maybe that is going part time, or getting rid of some debt first so you can take longer breaks and focus then.
The other difference I think showing here is that a side hustle doesn't look anything like a startup. A small business doesn't even look like a startup. If you have a startup you probably have VC and employees, then of course you should quit your job.
A side project you are trying to turn into a small business can be done alone and slowly scale up. At some point in that long process you will probably need to quit your job, but that will hopefully be easy to see when you get there.