Both Vanilla and TFMG add concrete, this is unacceptable.
There are a few solutions:

• Rename 1 of the concretes to something else
• Remove TFMG or Vanilla concrete (not ideal)
• Repurpose vanilla concrete as "the" concrete, but make it's variants and obtaining methods how it is in TFMG

It's seriously sloppy to have modded items with the same name and purpose as vanilla items

It's not really sloppy, most tech mods since the dawn of modding have added concrete and kept them since vanilla added it. Renaming vanilla concrete seems kinda unfeasible, and removing TFMG's concrete would be a very bad idea, as it's a heavily used building block for a lot of TFMG players