Hey false.

I know you are good beginer by creating good mods that are useful! I support you but in the future is it possoble to do it on 1.12.2 or no?

Beacuse

• The 1.12.2 version offers more stability and compatibility with other mods.
• The 1.12.2 version has more features and updates than 1.7.10.
• The 1.12.2 version allows for more complex and advanced modding, which can create more interesting and immersive experiences for players.

No need to rush but just asking.
Beacuse 1.12.2 cannot support 1.7.10

1.12.2 or higher has more ids for biomes probably
eids is useless on 1.12.2

I only develop mods for the superior 1.7.10 version.

As for more "complex" mods, coremods in 1.7.10 can be as complex as you want them to be.

See also:
https://reikakalseki.github.io/minecraft/pages/info/updating.html
this article has a lot of great talking points about why developing mods past 1.7.10 is actually more restrictive than staying on 1.7.10.