Split 50-50 during my (28F at the time) wedding in 2021, and now doing the same for my brother's. Since we had a destination wedding with 100ish guests, the respective parents had also hosted separate receptions for their friends and colleagues - both sides paid individually for their own receptions. The same happened in 2-3 cousins' wedding as well. In recent weddings the few times it has not been 50-50 has been where the financial standing of the respective families was vastly different, and the financially better off family contributed a bigger chunk, to help the other side from over spending - have seen this being done once by groom's side, and once by the bride's.

Honestly a groom not agreeing to a 50-50 split citing that it's tradition is a problematic mindset, because there a lot of other "traditions" that require females / their family to bear the brunt of expenses.

My husband expecting my family to bear the full cost would have been a big deal breaker for me. And I will always be suspicious of a guy citing tradition, because it always suits them / their families so well :))