Whenever I start building a modpack, I always end up building around Dynamic Trees because I like the look and aesthetics. It makes it hard to add Fabric mods because the main mod is forge only. Shit ends up being Vanilla+ 3D Terraria-like without the NPCs because my standards are too high and I haven't found an NPC mod that's not too cluttered or has a clashing artstyle.
Sometimes connected textures just doesn't end up working, sometimes Diagonal Fences just doesn't end up working. If I use connected textures then I can't use terrain slabs because the seams clash. Sometimes Dynamic Trees doesn't want to add bushy foliage leaves to the leaf blocks, if I use a bushy leaves resource pack. It's endless.