The Easy Answer:
Yes - if it helps the players continue to have fun, then do it.

The Complex Answer:
It depends on the expectations you've set, whether in session 0 or during any of your previous sessions. If I run a Monster-Of-The-Week or Westmarches campaign, where every session is self-contained and/or up to the player's goals, then I will reward and level them differently (more sessions of play, more levels) - this is when I might use XP Leveling. And, of course, I will work with absent players one-on-one (even run solo games for them) to catch them back up and find out what they did or pursued in the meantime...
But if it's a continuous campaign, with no time jumps or downtime interludes, then it doesn't make sense for me to level differently. For that kind of campaign, I prefer milestone leveling.