You will miss out on all modern Minecraft features like the Nether update, deep caves, and new combat mechanics unless you use "backport" mods. Top Mod Recommendations for 1.7.10
Legendary mods like Thaumcraft 4 , Witchery , and OreSpawn are primarily playable on 1.7.10 and were never fully ported to newer versions with the same level of quality. mainkraft s 170 modami skachat
I'm considering also going through past popular and influential modpacks and looking through their lists as well. * Orichalcum448. Reddit·r/feedthebeast You will miss out on all modern Minecraft