A new realistic Realm

I know adding more realistic physics would break a lot of existing builds. For example, If gravity worked on everything, a lot of builds would just fall apart because they have unsupported structures. Well, what if a new realm was added that could only be accessed if a person has sufficient Hardware capabilities to support it, and in that Realm all of the existing blocks would work, but would all be affected by gravity in the same way that blocks like sand and gravel are in the Overworld realm, the Nether realm, and the End Realm. I'll tentatively name it after myself, and call it the Kronos Realm, but you can name it whatever you feel like it if you decide to use the idea. For the most part, the Kronos realm would work like any of the other realms, but the basic idea would be to try to add some of the physics enhancements that have been most requested over the years, but couldn't be added in existing Realms without breaking existing builds. Since none of those builds were built for the new realm or in the new realm, the improved physics wouldn't break them. I'm not sure what would be the best way to handle being able to make ceilings and things like that in the new realm, but I would think that people playing Minecraft for all those years have probably sent in suggestions for such things many times. My first thought on it is that perhaps there could be more than one tool for placing blocks so a block could be placed as stuck to the block that had the focus when it's placed.