> Simply put, you won't be able to score a client that needs (let's say) both server side, front end, android/ios app finished in the same time.
While that might be the case for some clients or projects mostly the problem is a sales and legal one.
Single freelancers can't afford to deal with ridiculously complex enterprise sales processes.
Large clients on the other hand for the most part don't want to be directly involved with contractors due to administrative (managing accounts payable for a huge number of small suppliers instead of just a handful of large suppliers) and legal reasons (managing and assessing individual supplier contracts; depending on the country and how you market your services as a freelancer there can also be issues around fake self-employment, which this way large clients can conveniently outsource to a third party).
While that might be the case for some clients or projects mostly the problem is a sales and legal one.
Single freelancers can't afford to deal with ridiculously complex enterprise sales processes.
Large clients on the other hand for the most part don't want to be directly involved with contractors due to administrative (managing accounts payable for a huge number of small suppliers instead of just a handful of large suppliers) and legal reasons (managing and assessing individual supplier contracts; depending on the country and how you market your services as a freelancer there can also be issues around fake self-employment, which this way large clients can conveniently outsource to a third party).