Lowlight Cameras Can't Beat Stealth [video]
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What I found (admittedly limited research so happy for any sources on the topic) suggests an effective target detection range of about 10 km and an engagement range of about 6 km [0] for such sensors, which would validate OPs assertions considering the initial examples were at more than double the distance and went far beyond (50km/160000ft) by the end of the video.
[0] 50000ft
[1] https://www.spiedigitallibrary.org/conference-proceedings-of...
https://militarywatchmagazine.com/article/su35-fourth-sensor... 90km range claimed
Also, consider why many surface to air missile systems have optical tracking capabilities. Surely those are effective or they wouldn’t keep adding them to new models, right? Even the F-35 itself uses cameras to search for and track targets at long range.