Industrial uses need reliability. Heat is the main enemy, because it shortens the lifespan of devices and makes them fail sooner. Rougly, for every 10˚C of higher temperature, the lifespan halves. CooliPi 4B removes heat where possible, to get rid of excess heat and avoid forming thermal hotspots, thus increasing reliability and MTBF.
Industrial uses may involve demands for integration into a chassis, including protruding I/O ports to the front of the industrial case. The heatsink is aligned with the pcb on the I/O port side, so that the ports can be inserted into cutouts and face outwards the enclosure.
The heatsink/Raspberry Pi 4 model B combo can then be mounted with spacer studs with M2.5 screws. The height of them is then user's decision.
GPIO breakout is firmly fastened to the heatsink.
Industrial users may like the mounting of HATs and pHATs firmly to the set. Airflow around HATs is vertical, not obstructing airflow to the heatsink itself. Here's shown our own expansion board with hybrid mount (pHAT and HAT holes simultanously)