You can see from the details below that the iPhone 11 Pro cameras are ISO, aperture and shutter speed constrained. Compare to my Fuji X-T2 + Fujinon XF16-55mmF2.8 R LM WR lens. The iPhone 11 Pro cameras have a fixed aperture of ƒ/1.8, ƒ/2.0, ƒ/2.2 and ƒ/2.4. The lenses can not be stopped down. The iPhone 11 Pro always shoots wide open. The iPhone 11 Pro can not shoot at ISO higher than 3072. The slowest shutter speed is 1s which limits its use for long-exposure photography.
Fuji X-T2 + Fujinon XF16-55mmF2.8 R LM WR
Min/Max Aperture: ƒ/22 / ƒ/2.8
Min/Max Exposure: 1/32Ks / 60min
Min ISO / Max ISO: 100 / 51200
Focal Length: 16-55mm (24-84mm FF) (depends on lens)
Image Size: 6000 x 4000
Autofocus Systems: Intelligent Hybrid AF (TTL contrast AF / TTL phase-detection AF)
iPhone 11 Pro (Frodo)
Back Camera:
Aperture: ƒ/1.8
Min/Max Exposure: 1/125Ks / 1s
Min ISO / Max ISO: 32 / 3072
Focal Length: 4.25mm (26mm FF)
Image Size: 4032 x 3024
Autofocus Systems: Contrast, Phase
Flash: Yes
Back Telephoto Camera:
Aperture: ƒ/2.0
Min/Max Exposure: 1/45Ks / 1s
Min ISO / Max ISO: 21 / 2016
Focal Length: 6mm (51mm FF)
Image Size: 4032 x 3024
Autofocus Systems: None, Contrast, Phase
Flash: Yes
Back Ultra Wide Camera:
Aperture: ƒ/2.4
Min/Max Exposure: 1/45Ks / 1s
Min ISO / Max ISO: 21 / 2016
Focal Length: 1.54 (13mm FF)
Image Size: 4032 x 3024
Autofocus Systems: None, Phase
Flash: Yes
Front Camera:
Aperture: ƒ/2.2
Min/Max Exposure: 1/48Ks / 1s
Min ISO / Max ISO: 23 / 2208
Focal Length: 2.71mm (24mm FF)
Image Size: 4032 x 3024
Autofocus Systems: None
Flash: Yes