Sorry but it's not at all. How dare they not spend every waking moment wage slaving away!
People live their lives, this type of thinking shouldn't be normalized. What other subconscious biases are lurking here? I assume the follow up to this is "Hiring is hard, there's not enough good candidates".
Okay, but hiring someone is an investment. You pay them money for month until they become productive, you'll need someone to explain things to them etc etc. "Will they stay on for more than three months?" is a valid question to ask yourself when you're making a hiring decision.
It's not all about the potential employee's self-actualization.
It's perfectly fine to have gaps and "live a little" or even a lot, but it's also perfectly fine to prefer people who you believe will provide more value to your company.
There are infinite reasons why someone might take time off. Its arguably far more responsible to do so than continue employment and lower the priority of employment obligations in your life while you tend to other aspects.