Exactly, they're the gatekeepers, so everything has to go through them.
Go back a few decades and they did a lot more themselves, i.e. minor surgery, attending emergencies, etc., but it's morphed into an "admin" role but they're still the gatekeepers controlling access to everything else.
That works if they are good at diagnosing and sign posting, but a lot aren't, hence the sheer number of "fob offs", misdiagnoses, etc.
And the time and experience of highly trained professionals is being wasted on trivial stuff where people should be able to self-refer, i.e. physiotherapy, podiatry, audiology, etc. It's madness that you need a GP examination and referral for a hearing aid or an ingrown toe nail. If you have hearing problems, you should be able to go straight to audiology, in the same way you go straight to a dentist with tooth problems or an optician with eye problems.
It happened when I first needed a hearing aid, six months of farting around with the GP, getting appointments, them saying I had wax which needed removal first, then another appointment to check they were clear, then they forgot to send the referral, then a few months later, after I'd chased, they needed another appointment to check the ears again to do the referral as the time had passed, etc. Complete stupidity and waste of time.
Same with our son with his ingrown toe nail. Farted around with the GP surgery for about six months again, numerous appointments with GP and practice nurses, all with different treatments, but none worked, so finally and reluctantly referred to podiatry. Finally, the toe nail was off and healing within 2 weeks of the referral, after 6 months of pain farting around with the GP surgery!
They cause a lot of their workload by not diagnosing properly in the first place, not providing the right treatments, and delaying referrals to the specialists.