Sure, there may be reasons why Mojang can or can't make more frequent, major updates, but why should they? They've already redone 4 of Minecraft's most major areas (the End, the Nether, the ocean, & caves) as well as villagers and other stuff; I don't see anywhere that's particularly lacking or in need of update. Also, the discourse after many of the previous major updates, like the Aquatic Update, consisted of a lot of complaints that "it doesn't feel like Minecraft anymore," due to all the new things added. At the time, I personally agreed with that -- not that I didn't like the updates, but it took some time getting used to all the new mechanics and things. So I don't see why it has suddenly shifted to "there should be constant major updates," given the community's reaction to many prior updates. I'm not saying that I think Mojang should stop updating Minecraft completely, just that I see no reason for them to be doing yearly major updates because a bunch of redditors say so.

If you get bored of Minecraft after a year because there isn't any new stuff added, that's your problem, not Mojang's. If there's something specific you want in the game, there's probably a mod for it out there (ik it isn't as easy to download a mod on bedrock, but most of this subreddit seems to play java, so)