Neonchameleon
Legend
Assuming by "that" you mean getting worse rather than changing then 4e. At launch the PHB was at least six months from being ready and adding books didn't add too much power creep because there was structure.Is there any edition of D&D where that isn't the case? 1e, maybe, but even then, people will debate Unearthed Arcana's additions until the cows come home.
4e also has the distinction of outlasting the edition intended to replace it in the way 3.5 or 5.24 did their predecessors (Essentials) - but Monster Vault is better than the MM1.
For that matter I prefer 5e with Tasha's and Xanathar's to 5.14 core. I'd say it's only 2e, 3.0, and 3.5 that managed to bury themselves.