You are right, I remember that the first one they did it with was the Lamborghini Sián, even the Bugatti Chiron had stickers, since they introduced it I think it is something indispensable, hopefully one day we will have it even in the cheap sets.

That would be a dream! There are many of us who are very bad with stickers 🥴

In fact it is a matter of time, already in some cheaper Speed Champions sets this is happening, the lights and grill of the Mercedes AMG Project One ( https://brickrr.com/d/310-lego-speed-champions-2022/14 ) are painted, also happens with the Aston Martin DB5 ( https://brickrr.com/d/310-lego-speed-champions-2022/19 ).