Raspberry Pi 4 needs heatsink or cool fan?

Raspberry Pi 4 CPU Temperature

Previously I have Raspbian Buster written to a SD card.  (see write Raspbian Buster to SD card on Linux)

Without GUI, only ssh into it, temperature was 46 degree Celsius.

    /opt/vc/bin/vcgencmd measure_temp
With GUI and browser opens 4 web sites at the same time, temperature was 60 degree.
(my indoor temperature is 22 degree)

According to some online info:
60 degree is the soft throttle
85 degree is the hard throttle

ref: https://www.raspberrypi.org/blog/thermal-testing-raspberry-pi-4/


My conclusion:
Working range from 40~80 is acceptable.
Normal web browsing one at a time, no worries.
(If temperature too high, pi will slow down CPU frequency to reduce heat automatically)
Any processing intensive operation, for example, building a library from source code, do get some cooling solution.