Satellites usually need to point their solar panels and high-gain antennas properly in order to stay powered to be able to communicate with ground stations, although this particular satellite seems to have been unable to use its high-gain antenna anyway and relied on an omnidirectional one anyway. Another issue would be thermal management as it is possible that not all parts of the satellite were designed to deal with direct sunlight. I would be more worried about all the sensors, though. The days of secondary electron conduction tubes [1] might be long over, but many instruments still prefer not to be pointed directly at the sun.

Speaking of those other sensors, spinning the satellite would mean pointing all of them away from where they are supposed to be looking – not necessarily a net win.

Finally, trying to spin the satellite at anything approaching 360 RPM might end up dramatically shortening the mission [2].

[1] https://en.wikipedia.org/wiki/Apollo_12#EVAs

[2] https://youtu.be/AqeJzItldSQ?t=90

EDIT: In case you do not feel like watching the video, [2] shows a Little Joe II rocket (https://en.wikipedia.org/wiki/Little_Joe_II) breaking up due to an excessive roll rate (around 56 RPM) (https://en.wikipedia.org/wiki/A-003).