Describe the feature

A Storage Block item that has a recipe and cost similar to a Disk, using Storage Components of varying sizes to make Storage Blocks of those sizes. There would be different types of Storage Blocks for Items, Fluids, and Chemicals (mod support like Mekanism). One could craft a Storage Block directly with a Storage Component, or craft a Storage Block Housing and combine that with a Storage Component to make a Storage Block. One could also convert a Storage Disk to a Storage Block, or a Storage Block to a Storage Disk. This conversion maintains anything stored in the Block/Disk before the conversion, so the new item has the same stored stuff as the old one. Additionally, versions that are portable, like a more fancy and useful shulker box, with sorting and easy connection to a larger storage network, would be very useful too!

Reasons why it should be considered

One thing I really like about this mod is how simple it can be to get a basic setup going. With just a Terminal and an ME Drive with a Disk in it, plus a power source, you can already start storing items. However, even then you still have to make an ME Drive and a Disk for it, and I think that the earliest game start up could be made even simpler, while not sacrificing expandability or compatibility with later mid-game storage setups. I'm suggesting this here as the removal of the type limitation makes it reasonable and possible to have just a single DISK, or now Storage Block, fulfill all your early storage needs.

And that is with Storage Blocks. Yes, there is the ME Chest, but each one of those costs more than it does to make a new Disk, plus an extra, unneeded, Terminal, and the ME Chest terminal can't see what stored in other ME Chests, even if they're on the same network. However, if there was a Storage Block that cost the same to build as a Disk, but was a full block that could be placed in the world, one could build just a single Storage Block, plus a Terminal, and have a working storage setup! And expansion would be easy, just build another Storage Block and place it alongside. And unlike with two ME Chests (which would be much more expensive to build), that single Terminal would be able to see and access all of the contents of both Storage Blocks. And when late-early-game comes around and you've built an ME Drive, you'll still be able to access everything on all the storage blocks, as well as all the other disks in the Drive. And with a recipe to convert a Storage Block into a Storage Disk, while keeping all contents, changing and upgrading your initial super easy early-game setup later on, if you wanted to, would be super easy!

Additional details

I really hope this makes it into 1.21.1, as that's the version I'll be playing for the next long while...

Just make a drive. I don't see the advantage especially given the effort it would take.