"affects your field of view (how close you are to your subject),"Quote from online photo website -- " The crop sensor affects your field of view (how close you are to your subject), your depth of field (how thin your focus plane is/how much background blur you’ll get) and the amount of TOTAL light hitting the sensor (same amount of light per square inch of sensor, but less total light because you have less sensor area) and therefore your image quality.". Crop sensor being smaller sensor.
So f1.7 on small sensor does not mean more light than f2.8 larger sensor
I'm not arguing with their conclusion but they're off base on their definition of field of view. It's not distance from the subject. It's the angular width of what the camera sees, expressed in degrees or width at a specified distance.