Your relationship with your IT person can be a somewhat fragile dichotomy, sure you’re friendly with them and they’re probably a great person (you chose/hired them after all).
But for many small business owners they couldn’t really tell you what this person does beyond making the computers “work”. You hired them for their skills and those skills should exist outside the realm of what you could manage for your own IT (though many owners try).
So, if they quit, you’re suddenly in the lurch.