Apple says resistance can decrease with normal wear
Apple
Apple explicitly states that splash, water and dust resistance are not permanent and may decrease through normal wear.
Based on: Apple

No. A smartphone's water resistance is not necessarily permanent. Normal wear can reduce the protection it had when new.
Apple states that splash, water and dust resistance are not permanent conditions. Google similarly warns that normal wear and tear can reduce a Pixel phone's water resistance.
Apple's ratings describe testing under controlled laboratory conditions, with limits that vary by model. Those results do not establish unchanged protection throughout a phone's life or resistance to every kind of water exposure.
Water resistance describes limited protection, not a permanent guarantee. Its effectiveness can decrease as a phone wears.
Apple
Apple explicitly states that splash, water and dust resistance are not permanent and may decrease through normal wear.
Based on: Apple
Google says Pixel phones are designed to resist water but that normal wear and tear can reduce that resistance.
Based on: Google
Apple
Apple describes controlled laboratory testing and lists different depth limits for different iPhone models.
Based on: Apple
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