first off how hard is it to make addons or convince someone to make an addon
id like to learn cause i feel that what will truly fit my world im not going to find
im excellent at command blocks not the best but i make some neat things
second i noticed that there are addon that can make new mobs w/o replacing old mobs can the same be true with like say weapons
im wanting some modern weapons w/o replacing anything i need would be ideal to not replace anything however the things i am able to replace most addons avoid replacing cause in normal worlds there used often but im making an mmo realm i also have a few elements i can use 70+ are taken for new blocks 3 for elytra fragment still alot left
so to clarify wondering if tool addons can be done without replacing anyblock in the same way mobs can now and if not will can i do the addon to any block or do tools need to stay with tools
third does anyone know a modern weapons addon that meats those perimiters theres a really cool 1 for mcpe but it uses blocklauncher so i cant upload it to realm
if so, i can assure you that EVERYTHING is possible in minecraft modding. things like new blocks, biomes, weapons, mobs and similar things are only scratching the surface. i personally dont know how to make mods, but i have played a lot with modpacks which include hundreds of mods, each changing the game minutely, and together granting an experience nearly completely different from the vanilla gameplay. this may not help you in your attempts to create custom content for minecraft, but at least now you know that these are called mods, and can research the creation process from there.
you can download other people's mods on sites like curseForge, or try out premade modpacks on the Twitch launcher.
next, i want to tell you that i am sincerely sorry that the minecraft community has let you down in answering your questions. biggest apologies.