Could it be that someone thought adhesive would be less prone to cracking from stress than solder?
More likely, it was a process decision. They most likely wave-soldered the board, but the switch side has gold-plated switch contacts, so they couldn't wave-solder that side. So, to put a few components there, they used the adhesive. (The alternative would have been to hand-solder SMD parts on that side, and I'm not aware that HP ever did that.)
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