Yeah, I’m sure a lot of people miss it. If you opened the app to a job that you did last, just click the white Glowforge icon at the upper left row to go back to the Dashboard. It saves your latest file and you can see and select all of your other files.
There are cool things on the Dashboard. See the little gift next to your name at the top? If there is a red dot on it, then the Glowforge team has loaded a new freebie there that you can go and download. They put a new one up every few weeks.
And the most recent upgrade is always listed under the Gallery pics.
The use of the magnets is a personal decision. I haven’t cared for them since some early tests with the PRU, when I suspect they were causing other issues with the head, so I use the Honeycomb Pins instead. But some people do love their magnets, and I’m obviously not going to change anyone’s mind about using them, (especially since we’ve got that beautiful steel tray just begging for magnets to get stuck on it), so I know when to give it up as a lost cause. 
Here’s what makes sense though with the magnets…use non-neodymium magnets to hold down paper and you should be fine. Smaller magnetic field, and it’s farther away from the head, so it’s not going to stop the fan. Using the world’s most powerful neodymium magnets without shielding is going to stop your prints and ruin a lot of material. The decision is up to the individual.