I can only agree with this, I tried the beamer for the first time on a white plaster wall. (Mariokart, Youtube, Netflix) and it worked great, good picture, brightness, etc. Now with a screen, because it's a bit better, but not necessarily.

We also need it without a canvas, super picture. But now we use it on a wall without structure.

sensational, a screen is not necessary. i bought a screen because i don't have a large enough white wall surface in the house. but the projection on four white 60 cm wide curtain panels also works very well.
Tip: first try it out without a screen and if it is not satisfactory, buy a screen as large as possible. mine is 92", today I would order a wider one. I can only recommend the unit. It has exceeded my expectations.