Ender 3 V2 Auto power off switch-simple!

Ender 3 v2 auto off - simple!
I don't understand why the manufacturer doesn't have a built-in auto power off feature after it's done. It makes us have to upgrade ourselves right? You can refer to the video link on my youtube:
https://youtu.be/6pnaa5Dzn6g
And Filament i use:
https://www.amazon.com/AmazonBasics-Printer-Filament-1-75mm-Spool/dp/B07T616NXL?c=ts&keywords=3D%2BPrinting%2BFilament&qid=1648048225&refinements=p_72:1248921011&rnid=1248919011&s=industrial&sr=1-5&ts_id=6066129011&th=1&linkCode=sl1&tag=991003-20&linkId=52e3a35ea03ba51af58702d196c805e5&language=en_US&ref_=as_li_ss_tl

- End G-code:

G91 ;Relative positioning
G1 E-2 F2700 ;Retract a bit
G1 E-2 Z0.2 F2400 ;Retract and raise Z
G1 X5 Y5 F3000 ;Wipe out
G1 Z10 ;Raise Z more
G90 ;Absolute positioning
G1 X0 ;X go home
M104 S0 ;Turn-off hotend
M140 S0 ;Turn-off bed
;*** Message and End Tones
M117 Print Completed
M300 S440 P200 ; Make Print Completed Tones
M300 S660 P250
M300 S880 P300
;*** End Message