In cell phone sensors they are getting to the point that removal of the UV filter likely makes sense as well because of pixel pitch.
How would removal of the UV filter based on small pixel pitch make sense? UV wavelengths are shorter than visible light. Perhaps you meant the IR cut filter?
On tiny camera systems, with little in the way of a lens in front of the sensor, UV might be an issue.
But since glass already attenuates a great deal of UV, specifically filtering for it may become unnecessary.
Add to that large, multi-element lenses and their intrinsic coatings bandpass, there's likely very little UVA reaching a sensor, much less shorter wavelengths.
You are still gathering that heat. It will either be directly in the sensor itself, or a fraction of a millimeter above it. One way or another, the ambient temperature of the sensor is going to increase, so why put in an unnecessary filter?IR certainly an issue for now, but not likely for causing much in the way of heat gain unless aiming at some well lit scenes without a shutter in the way. The electronics and remainder of the system packaging is likely to radiate more heat to the sensor than what comes thru a small aperture.