The problem with this argument is that it implies "you're special".
And you likely have experience, domain knowledge, product knowledge, customer knowledge and so on, so I'd argue you Are special.
But then you leave, and need to be replaced. Since I'm hiring from a pool where no-one has this special, I may as well hire from overseas. Its cheaper.
Equally, when you work remotely your special is invisible. The way you keep the customer happy is invisible. The way you enable your team (assuming your special is passed on) is invisible.
Of course there are very smart people, with lots of experience, and lots of special of their own. Finding them is hard (of course) but the reward for finding them is significant.
FAANG companies are skipping the labor broker, and building subsidiaries offshore. Those offices pay local rates, have as-strict hiring policies, and are growing.
So your point us well made- existing employees have value. But companies deal with churn. And we don't need 300 people onshore with your special skills. We can offshore 200 posts, and wait for them to come up to speed.
Being a remote worker makes this process easier.
