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Around L2 one benefits from a virtually unchanging environment with very stable thermal conditions, an essential asset for the success of the mission. The optics are so sensitive to minute changes of temperature that a variation of less than one thousandth of a degree over a few hours would disturb the alignment of the mirrors and degrade the quality of the images.
Gaia can not afford to enter eclipse during its mission because it would cause a significant thermal shock to the system that would render the observatory useless. That is why Gaia has to avoid the Penumbra Zone for the duration of the science mission and extended mission. The initial orbital parameters of Gaia have been chosen so that the Lissajous Orbit evolves in a way that avoids a solar eclipse for 6.3 years which is long enugh for the primary and extended Gaia mission.
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