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Using ethernet hub or switch will add a lot to network latency, so it might not work at all, even if everything else works.
Never tried with a hub, but i do have a switch that works with Mesa boards for days without issues.
Still, i never use a switch on production machines, the risk is to big.
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Network hub = old, any packet sent to any pc wired to it will be sent to all connected PC's.
Network switch = new, any packet sent will be sent only to the PC with the IP address contained in that packet.

At 1ms tick time round trip for the ECAT bus, you can theoretically achieve .001mm granularity of position. At that rate one could also have 60000mm/m velocity or 2362 ipm. Very few machines in the CNC world can even handle such speeds and the acc/dec inertial demands this velocity creates. Any attempt to advance the bus cycle time aka tick time is a waste of time and energy especially for a hobby/light industrial machine.

I would recommend doing some study of basic physics before walking down a road to nowhere. No matter how faster your motor, bus, etc... you are limited by the physical construction of your machine. Period. End of discussion. Or you have a $1 million machine for the likes of DMG or Chiron. Or simply a million bucks you like throwing away fixing the scrap heap that speed would create of your machine.

Millions of motion control systems utilizing ECAT run using the standard tick cycle of 1ms. I will default to a proven theory put to practice any day. A theory I have proven over years of practice myself.

Have a nice day.

Are the stepper motors 0.9 degree per step?
Should be written on the back of the motors.

in principle, yes,
but you would have to build the hal component in such a way that the ethernet packets are sent and received in parallel,
otherwise it takes too long.

EDIT:
but since udp is used, this can lead to collisions.
maybe send with minimal delay and then wait for the responses

Hi Linuxcnc community, 
I have installed OS in raspberry 5 and Instead of using IO expander I want to use individual ESP32+W5500 for every motor and generate step pulses. If this is possible please help me with the steps in achiving it.
Refer the image below and get what I want to achieve
https://drive.google.com/file/d/1JCuLksqd7dcpAcJ44GajRwzOFmay_xuQ/view?usp=sharing 
Thankyou

AFAIK with parallel port breakout, you will be able to do only step/dir signals - if those servodrives do accept step/dir then you definitely can reuse them. The problem will be the parallel port. It is slow and limits your I/O and also has become ancient relic in PCs. That is why most of folks are using Mesa boards. But for that we need to know more about the drives