Actually this is not in beta anymore.
The XP system should have no impact on adults as it only affects cosmetics and adults should have grown out of caring about things like that.
I agree on the XP system but it will lose player count over it in time
It is still in BETA.
On behalf of the entire Halo Infinite team, and in celebration of Halo’s 20th anniversary, I am very happy to announce that your Spartan journey begins… today! Sincerest thanks to the entire Halo community for your support, passion, and feedback. This day belongs to all of you. Whether you’ve been part of the community from the beginning or are joining with us today, welcome! Please read on or jump directly to the Halo Infinite multiplayer beta download links
HERE.
Why is this release a beta? Our previous Multiplayer Technical Previews went a long way to battle-testing our services and infrastructure. But as we prepare for a significant increase in the number of players jumping into Halo Infinite on launch day, December 8th, we want to ensure all our systems are good-to-go. While you may experience some bumps and bugs during this beta period, it does mark the official start of Halo Infinite Season 1, with all day-one maps and modes enabled as well as the full Season 1 Battle Pass. This means all the Battle Pass and customization items you earn or purchase during the beta will stay with you after December 8th.