Sure, it's not just thank you cards though. I once had a job in which my boss assigned me the weekly task of manually emailing an automatically generated report to his boss, and insisted that each email have unique body text amounting to "here's that report you asked for" but stretched into three or four sentences, custom written each week and never repeating. The guy apparently hated to receive automated emails and would supposedly be offended if I copy-pasted the same email every time.

Absolutely senseless work, perfect job for an LLM.