Is the 8 GB of RAM enough?

For web browsing, documents, video and light photo editing, yes. For many browser tabs at once, virtual machines or heavy creative apps, it is tight and cannot be upgraded later.

Can it be used as a tablet?

Yes. The 360-degree hinge folds the screen all the way back, and the touchscreen works in tablet mode. At 16 inches it is large and heavy to hold for long.

Is the OLED screen good for outdoor use?

OLED gives strong contrast and color, but glossy touch panels reflect light. It is best indoors or in shade; expect some glare in direct sun.

Does it come with a stylus?

Lenovo sells an active pen separately for this line. The laptop supports pen input, but check the box contents, since a pen is not always included.

How does it compare with the 14-inch Yoga 7i?

The 16-inch gives a bigger screen and more room for split-screen work, at the cost of weight and portability. The 14-inch is easier to carry and better for commuters.