Hi ! Here we go !
1- No the nextion can only store one template at a time, it's an hardware restriction
2- Nextion is good for a simple and affordable embedded display (with a single usb connection) it's big brother the usbd480 does a better job as it can run dashstudio, but price is really high compared to nextion
To compare nextion to a phone here a little pros and cons :
nextion :
- pros : single usb connection, no app to start on the display itself, decent price, can be properly encased, when running over an arduino pro micro there is physical led support available
- cons : the manufacturer editor could be a little more friendly and open. A single template at a time
phones :
- pros : runs all dash studio designs,
- cons : encasing is more complex, iphone specifically does not support landscape rotation lock without jailbreak (android do), expensive for the purpose if not using a recycled phone.
there is a last option thought : small hdmi screens, you can find small models at various sizes (look for waveshare pc compatible screens)
As you can see each option can find it's specific conditions where it will fit better.
I would take into order :
- HDMI screen : when running two cables is not an issue, one of the best result on a budget
- USBD480 : When you have the budget, not the most beautiful display but the best to integrate in a wheel with a simple usb connection.
- Phones or tablets : when you have one to recycle under hand
- Nextion : embedded display on a budget with a single usb connection, but with the limitations exposed above.
For the history records, I added the nextion support when cheap hdmi screens were not a thing (or were as much expensive as a lambo), not sure if I was starting from scratch simhub I would dig again into those screens, the evolution of the designer have been a bit deceptive over the years and the manufacturer refuses any enhancement suggested by the community in order to make the designer more comfortable. But since it's already here I keep the support