Is it necessary to enable PID for the heat bed?

I'm trying to upload the new marlin firmware to my board but I'm getting an error:-




Arduino: 1.8.5 (Windows 7), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

sketch\Marlin_main.cpp: In function 'void gcode_M304()':

Marlin_main.cpp:8930: error: 'scalePID_i' was not declared in this scope

if (parser.seen('I')) thermalManager.bedKi = scalePID_i(parser.value_float());

^

Marlin_main.cpp:8931: error: 'scalePID_d' was not declared in this scope

if (parser.seen('D')) thermalManager.bedKd = scalePID_d(parser.value_float());

^

In file included from sketch\Marlin.h:46:0,

from sketch\Marlin_main.cpp:244:

Marlin_main.cpp:8937: error: 'unscalePID_i' was not declared in this scope

SERIAL_ECHOPAIR(" i:", unscalePID_i(thermalManager.bedKi));

^

sketch\serial.h:52:76: note: in definition of macro 'SERIAL_PROTOCOLPAIR'

#define SERIAL_PROTOCOLPAIR(name, value) (serial_echopair_P(PSTR(name),(value)))

^

sketch\Marlin_main.cpp:8937:5: note: in expansion of macro 'SERIAL_ECHOPAIR'

SERIAL_ECHOPAIR(" i:", unscalePID_i(thermalManager.bedKi));

^

Marlin_main.cpp:8938: error: 'unscalePID_d' was not declared in this scope

SERIAL_ECHOLNPAIR(" d:", unscalePID_d(thermalManager.bedKd));

^

sketch\serial.h:52:76: note: in definition of macro 'SERIAL_PROTOCOLPAIR'

#define SERIAL_PROTOCOLPAIR(name, value) (serial_echopair_P(PSTR(name),(value)))

^

sketch\serial.h:61:40: note: in expansion of macro 'SERIAL_PROTOCOLLNPAIR'

#define SERIAL_ECHOLNPAIR(name, value) SERIAL_PROTOCOLLNPAIR(name, value)

^

sketch\Marlin_main.cpp:8938:5: note: in expansion of macro 'SERIAL_ECHOLNPAIR'

SERIAL_ECHOLNPAIR(" d:", unscalePID_d(thermalManager.bedKd));

^

exit status 1
'scalePID_i' was not declared in this scope

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

if I comment out the "PID BEDTEMP" statement this error doesn't come.....
So is it really important for the PID on the heat bed to be on
(P.S. I don't know how to solve the error , so I'll be asking over here if I have to.)

I have been 3D Printing without #define PIDTEMPBED on 2 3D Printer for over a year now with not side effects.

Using bang bang on the heat bed is not usually that bad, worth a try but keep in mind if you use ABS you might get some issues due to warping IF the bed takes wild swings in temp.
Useing a thermal insulation under the bed helps alot with this!!

PETG your less likely to have issues.

PID is more for the hotend to keep it stable than for the hotbed.
You may also see a longer heat up time for your hotbed without PID...

Thanks a lot for your answers!!!!