I do similar- I wonder if part of that's age, or (gaming) maturity, or shifting priorities.. or what.
With certain games like West Marches, sure, each character tracks XP. But in a "standard" campaign where it's the same players and (mostly) PCs, you still get XP even if you missed a session- everyone tends to level at the same time unless something crazy gets thrown in that makes one PC have more XP, like the Sun card from the Deck or a few old AD&D items like in Night Below "a good creature reading this tome grants 10k XP, if the creature is an elf they get an extra 5k, the tome then disappears to another place."