You can stack cloaking field generators.

[Erik]

You can stack two cloaking field generators on top of each other to create a super invisible field without the usual overlays/static.

[Roomba]

The way I see it, it's a feature. If you spend twice the telecrystals to buy two cloaking field generators, you get double the invisibility.

It's not as uncounterable as you claim. It's pretty obvious if you're inside it, because your sprite goes invisible, and if you're suspicious of an area a bit of right-clicking will reveal it.

[Zafhset]

Stacking more than one CFG was an occasional occurrence back in cogmap1 - it worked well with super crusher traps, gravitons into space, etc-etc.

It's still perfectly counterable with methodical right clicking.