Fabs are only part of this, and not universal in EE research at all. However, almost all serious EE research requires at least $100k of lab equipment of one kind or another.

That's definitely an unfortunate part of EE, the hardware required to design hardware is expensive. CS requires a laptop and maybe some time on a server or a big GPU cluster, expensive to own but very cheap to rent.

I think the explosion in availability of inexpensive microcontrollers and FPGA dev boards have made it much easier for people to get into hardware design without spending a ton of money. This has also made it cheaper to buy high end test equipment, you don't need to buy a $3k Keysight oscope when a cheap Chinese USB oscope works just as well with plenty of features built-in for free. Obviously a proper academic or corporate research lab is going to be a lot different than a well-equiped hobbyist lab but the difference is not as stark as you'd imagine.