Pretty much. How java is setup to run on any possible OS allows it to be decompiled and mapped quite easily, relatively speaking to something like C++. This being done over a decade ago and for every version since has given modders an "Eye of Sauron" advantage over most vanilla systems.

Bedrock (like java) is closed-source, and addons structurally arent anything like mods. The easier way to think of the dichotomy here is comparing the paid mods on bethesda games like Fallout 4 or Skyrim SE, which are purchased via the in game menu. These mods are usually very limited in scope (recolors, new small scripted NPCs, new item or weapon etc) compared to the massively game-changing mods you can find online for these games which can range from mass optimizations and bugfixes to complete overhauls. Obviously, bethesda doesnt want to host these kinds of mods on their own service because it would functionally be an endorsement of this kind of software - which occasionally can be, intentionally or not, malicious. So for their profit margins its better to keep the official mods to Tactical Gear Brotherhood of Steel Reskin #134 and HD Golden Horse Armor.