The etymology might help break down some of the nuance here
According to etymonline the etymology for expatriate (often shortened to expat) is:
“to banish, send out of one’s native country,” 1768, modeled on French expatrier “banish” (14c.), from ex- “out of” (see ex-) + patrie “native land,” from Latin patria “one’s native country,” from pater (genitive patris) “father” (see father (n.); also compare patriot). Related: Expatriated; expatriating. The noun is by 1818, “one who has been banished;” main modern sense of “one who chooses to live abroad” is by 1902.
Immigrate, is similar, but is more used to describe moving to a place:
“to pass into a place as a new inhabitant or resident,” especially “to move to a country where one is not a native, for the purpose of settling permanently there,” 1620s, from Latin immigratus, past participle of immigrare “to remove, go into, move in,” from assimilated form of in- “into, in, on, upon” (from PIE root *en “in”) + migrare “to move” (see migration). Related: Immigrated; immigrating.
The closer synonym to expatriate would probably be emigrate, the opposite of immigrate, to leave a place.
As to why one might use expatriate over emigrate; consider the sentence “I’m an American immigrant”. It’s kind of unclear if you’re trying to say that you are an American that has migrated to another country (as in “I’m an American immigrant living in Brussels”*), or someone who has migrated to America (as in “I’m an American immigrant from Slovakia”). Using expatriate removes the ambiguity: “I’m an American expatriate” and makes it clear that the speaker is trying to convey where they are from.
* technically, using emigrant here would be more clear, but English is a lawless and lazy language
Echoing the other comment, I loved my Pebble because it was a smartwatch that was a watch first and foremost and everything after that was added to make life easier (rather than to pile on selling points that someone might want but that nobody needs). For example, the thing had a week long battery life (irrc the first gen iWatch had something like less than a day), but even when it hit the bottom 10% of the tank, it turned off non-essentials (like Bluetooth, calendar, customizations, etc) and just kept going on a default watchface. The UI was simple, easy to navigate, and generally useful. Physical buttons meant that I never had to fight with a touchscreen to clear notifications or check my calendar.
Plus the whole thing was stupid customizable. On the software side, the community grew a fairly sizable market for watchfaces to show pretty much whatever suited your fancy (TimeStyle was always one of my favorites, but I was also fond of this Pokemon one). On the hardware side, the watch used a standard 20mm band so you could go as far as to match it to your outfit if you wanted (I had a nice metal band to go with my Steel so I could dress it up for college career fairs (and have my calendar send me a reminder when it was time to duck off to class)).