Ideas, about how that in my opinion lacks MCreator:

Here is several ideas, about how that in my opinion lacks MCreator:
1.Block state support in procedures.

2.Variations of blocks and items with the same id (like coal and charcoal).

3.Really need the ability to bind a variable to a player, entity, item or block. Variables of type item and block. Arrays.

4.Slabs - in MCreator there are stairs, walls and fences, but no slabs.

5.When adding a liquid, it should be possible to automatically add a bucket of this liquid.

6.Custom crafting blocks: custom workbenches and stoves with custom GUI and custom crafting recipes. This can be implemented using procedures, but: 1 - it is not so convenient; 2 - minecraft does not recognize it as crafting and because of this there may be various bugs, especially when installing other mods together with the created one; 3 - as a consequence of paragraph 2, JEI does not recognize it as crafting, and does not show its recipe, resulting in a player who is poorly versed in mod will be extremely difficult to understand it.

7.Ability to create flying mobs that attack the player.

8.New triggers for living entities: "When that entity attacks another one" and "When another entity is attacked by this one". The difference is which entity is the provided entity. This is important so that the entity can, for example, poison or slow down the player when attacking. This should work in ranged combat too.

9.It is necessary to adjust the minimum level of lighting in custom dimensions (in vanilla minecraft the minimum lighting in nether is higher than in overworld) - by default it is equal to the maximum, this means that it is light everywhere and always, and it looks very bad.

10.It should be possible to adjust not only the nutritional value of the food, but also the saturation.

11.Instead of automatically creating portal igniter the ability to select an item that will perform this function from a list of existing in mncraft or mod. Portals of custom form or at least horizontal portals.

12.Improved structures - it would be nice to be able to create structures from multiple parts arranged partially randomly. And it is very important to configure loot in the chests of custom structures.

13.Loot tables support - ability to customize things that drop from mobs or blocks, as well as customize loot in chests of custom structures using loot tables.

14.Possibility to add chance of appearance of custom things in chests of vanilla structures. The ability to catch custom things during fishing. 

15.Opportunity to buy custom items from villagers. Custom professions of villagers. Custom buildings in villages.

16.Ability to limit which slots of the block inventory the funnel can interact with from the bottom, top or side.

17.If I want to limit the type of item I want to add to the GUI slot, then I can select only one item type, for example coal, and then only coal can be put in this GUI slot. But what if I want to select multiple items, for example if I need only a few specific items to be placed in the GUI slot, for example only coal or diamonds.

18.Custom particles.

19.Support RF (energy as in Indastrial Craft 2, Galactic Craft, and many other mods), blocks with liquid inside, for example, if their work requires lava, or other liquid, but not in a bucket, which would allow it to be shot through the pipes for liquids from any mod that adds such pipes (eg Build Craft).

20.Baubles inventory support.