No, they aren’t “in the habit of losing things”
generally they take very good care of their stuff. Beeping their phone at home is just a quicker way to find it- I do it all the time, put my phone down somewhere, get distracted and forget where. I often wish I could beep my glasses and car keys as well! But the phone isn’t “lost”, it’s in the house somewhere, it’s just taking seconds to find it vs half an hour of searching every room.
i’ve never had to replace anything because they’ve been careless with it. Sometimes shit happens, phone falls out a bag, they’re in a rush and leave it in a locker at the gym. That’s got to be three or four times though over 10 years for two kids, which I don’t think is unreasonable.
sharing their device location with me just makes it easier. They could track it on their laptops or by logging into iCloud on my phone, so if they were in the habit of losing devices they could be located without me having the tracking.
tech is also my job. So they are careful with their phones as they think I have ways of getting into their phones and/or seeing what they’re up to without needing permission 😂. I don’t, obviously, but they don’t believe me 😂