I voted Yes even though the latest patch notes about storage chests is going to bring in a QoL change to machines and coils. Basically, repair a machine or coil and it repairs all the attached coils and machines as well.
I do think that coils are a nice crafting sink in the game cause it seems like people are making new bases and builds all the time so creating new workshops tends to happen from time to time. Plus in the long term, I think the coils are going to be a better progression point for newer players when they get to that end game point or are farming up coin and mats to buy and craft their own.
A single mega coil would probably need to be a multi-block coil (3x3x3 of example) and require a lot of mats to craft too. It would be expensive as heck on top of that. Not saying I am against it or for it but from a space economic point of view for getting the most out of the space in your plots, I like it. I don’t think it would hurt the game to have it though as something beyond Advanced Coils.