Wrong!
every protocol has its electrical cable length limitations.
I2C --> cms (depends on speed);
the maximum bus length of an I2C link is about 1 meter at 100
Kbaud, or 10 meters at 10 Kbaud.
ref: I2C Bus Range and Electrical Specifications, Freescale 9S12 HCS12 MC9S12 I2C Hardware =So%20the%20maximum%20bus%20length,within%20an%20otherwise%20shielded%20enclosure.
SPI
While the SPI communication method is generally suitable for distances up to approximately 10 m
Ref: Isolated SPI Communication Made Easy | Analog Devices
RS232
Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten. This means that using a cable with low capacitance allows you to span longer distances without going beyond the limitations of the standard. If for example UTP CAT-5 cable is used with a typical capacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.
Ref: https://www.lammertbies.nl/comm/info/rs-232-specs
USB
If you are not using a regular cable, then the maximum active cable length for USB 2.0 is 30 meters (98 feet and 5 inches) and the maximum recommended length for USB 3.0/3.1 is 18 meters (about 59 feet). If you are using a regular cable (max length of 5 meters for 2.0 and max length of 3 meters for 3.0/3.1) with an active cable, then the maximum length for USB 2.0 is 25 meters (about 82 feet) and the maximum recommended length for USB 3.0/3.1 is 15 meters (about 49 feet).
Ref: USB Cable Length Limitations And How To Break Them
RS485
The maximum distance of RS-485 without using a repeater is 4000 feet (1220 meters) at baud rates up to 90Kbps.
Extend that distance by adding an RS-485 Repeater or Optically Isolated Repeater every 4000 feet.
Ref: http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/RS-485-Tips,-Tricks,-Questions-Answers/RS-485-Tips,-Tricks,- Questions-Answers.pdf
UTP Cat5/Cat6
The maximum length you can run Cat5, Cat5e, Cat6 and Cat6a cable is 100 meters or 328 feet. If you require a longer run, you will need to put an active component, such as a router, in-between the signals.
Ref: https://www.showmecables.com/blog/post/discussing-cat5-length-limits
etc. etc.
everything has limits.
RV mineirin