Music doesn't stay at the same tempo. It doesn't stay in the same time-signature. So you should practise with a metronome that understands the music.
Imagine leaning Stravinsky's The Rite of Spring with a metronome that understood all the time-signature changes in the Danse Sacrale. Here it is:
Click on the music to load the metronome. This is a view-only link: you can't make changes to the score, but you can play it, and you can click around and discover all the features it uses.
Because you're only setting time-signatures, bars, and metronome marks, you can create your scores quickly and efficiently. They are saved instantly in the cloud as you build them. You can share your scores with your other devices, for example building a score on your laptop and then sharing it to your phone which you have next to you when practising. And you can share your scores with other people too. If you're a chamber group trying to learn something challenging, only one of you needs create the score, and then shares it with everyone else in the group. If you're a teacher, you can add a score once and share it with all your pupils studying that piece.
You can view all the scores you've opened on this device, and from there you can create new scores.