I hate to hear when anyone gets laid off, especially long-time employees and especially when the economy is like it is.
When a company lays off a large percentage of their workers it means the company was poorly managed on several levels.
That said, I cannot imagine a company like Twitter needing 7,500 employees (total before Elon bought it) to operate, especially one with low level customer support.
I can see a company that produces products needing thousands of employees, but not one that's a user-generated informational service.
It is actually surprising that he only laid off 50% of the employees as I would think a company like Twitter would need only 500-1,000 employees to operate efficiently.