Local-first was the first kind of app. Way up into the 2000s, you'd use your local excel/word/etc, and the sync mechanism was calling your file annual_accounts_final_v3_amend_v5_final(3).xls
But also nowadays you want to have information from other computers. Everything from shared calendars to the weather, or a social media entry. There's so much more you can do with internet access, you need to be able to access remote data.
There's no easy way to keep sync, either. Look at CAP theorem. You can decide which leg you can do without, but you can't solve the distributed computing "problem". Best is just be aware of what tradeoff you're making.
But also nowadays you want to have information from other computers. Everything from shared calendars to the weather, or a social media entry. There's so much more you can do with internet access, you need to be able to access remote data.
There's no easy way to keep sync, either. Look at CAP theorem. You can decide which leg you can do without, but you can't solve the distributed computing "problem". Best is just be aware of what tradeoff you're making.