I think using an employer-provided card is superior for a lot of reasons, but spending 5 figures on a personal card and being reimbursed for it doesn't sound bad as someone with an extremely high credit limit and rewards cards that give 2-3% back on most purchases. I know some people who manage to fly first class to some pretty far-flung destinations using points they got from company spending on their personal credit cards.

That being said it can be pretty risky if your accounting department loses a check