I am of multiple minds on it.
I very much do like the idea of sharing your location (once you are in a committed relationship). Knowing when your partner is coming home or stuck at work or at the grocery store is useful. Same with knowing that someone can check in on you if something horrible happens. And I have 100% shared my location temporarily for that.
The problem is that... you don't always want to do that. And explaining that becomes a mess.
At its core it is opt in versus opt out but it also can trigger the kinds of conversations that are really better suited to a lot later in a relationship. Like with prenups. There are a lot of REALLY REALLY REALLY good reasons to have them but it is the kind of topic that you can't even raise without having the implication of "I don't trust you".