Just curious since there is often discussion about whether this watch or that is a "tool" watch and it often involves a watch with a mechanical movement (high-end divers, for instance). Is there a situation when a mechanical movement is really more practical as a tool? Seems like the few (not having to replace the battery?) are far outweighed by the many (cost, durability, accuracy). A $20 Casio seems like the ultimate basic "tool" watch.
Define "tool"?
Tool = a device or implement, esp. one held in the hand, used to carry out a particular function.
Both would seem to meet that requirement. Going everywhere, doing most everything & surviving = both again. Though I will throw out if the it can't do it & still be "okay" (i.e. crystal gets scratched = fail). Discussions of environments where humans can barely survive are assinine - doesn't apply to enough people. For instance "oh yeah, it's been on the moon"...............sure, population of 6 billion 12 have been on the moon = assinine.
I do get quite a laugh from various attitudes -
- wear a moderate/high end "tool" watches...."I don't where it xxxxxx, I'm afraid to damage it"

wow, sure glad you paid all that money for a "rugged" watch
- often touted cheap dive watch as being "rugged"............um. ah, given the scratchlex crystal pretty well eliminates if from both "rugged" and "beater" there Forrest
$20 Casio do the job for ya? Yep, then go for it. Me? I call a "tool" watch one that I never have to take off except for sleep & showers. Have one, been ten years & the only affects thus far are the dial has faded a bit & the second hand no longer has any paint on the tip = the sun has taken a toll. In ten years it's been "down" about 3 weeks. Three services of a week(ish) each............................far less than my wife's comparable quartz, that goes in every year - less time but probably adds up to more time overall. But it works for her & that's the key.