Good for you, if you don't mind carrying a tablet around in your hand or purse, in addition to your phone.
A lot of people prefer to carry a single device that fits in a pocket. It's surprisingly easy.
Another reason for divorcing functions between smartphone and tablets is to increase battery power resource.
Though many smart devices advertise all day power, this includes standby time unfortunately. It doesn't truly mean talk time, video time, or music playing them or combination of those which depending on your device battery size realistically translate to about 5-7 hours of real world usage [per battery in case of replaceable batter units and you don't mind pre-charging and bring a replacement along]
If you know you're going to be disconnected from a power outlet long enough and you need to ensure you last until your next opportunity to plug in while still being able to use your devices in a realistic sense, bringing a tablet with you make sense. You can use the battery on the tablet to consume while reserving your phone for sms, alerts, voice calls, 911, emergencies, etc.
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Like Maps, right? Apple also rushed out things before that were not "right all the way"
Even those who are patience and try not to rush can still make mistakes.
That said, I don't know how much time Apple has spent on maps, and if it was an issue with code, or with infrastructure, or situational with Google putting them in an odd position.
In some fairness, Apple version "1.0" maps wasn't that BAD, and was much better than Maps before it that was provided by "Google". Google was create much better Maps maps for Andriod and the iPhone version was severely inferior. (no turn-by-turn, etc).
After Apple release Maps they developed inhouse and decided not to continue with the Google-provided version, finally Google developed an release better Google Maps apps separately.
I don't know the exact nature of what happen and the specifics, but what I do know is the events, and because of it, we ended up with better map apps compare to what we had prior to that.
So even if you don't like Apple's Map, that move led to a better Google Maps as well. So it's win-win.