To digitise conventional analogue photos or slides yourself you need to buy a scanner or pay for someone else to scan your negatives, slides or prints. Easy to use. You don't need to be a professional photographer, or a computer whiz. 35mm film delivers an effective resolution far better than all but the most terrifyingly expensive digital cameras. Mind you, if your application doesn't need more resolution than a digital camera can provide, this is not a problem.
Digital cameras are expensive.
Most digital cameras can't do rapid sequences of shots, and no affordable ones can shoot continuously for very long. There's a gap of several seconds between shots, or bursts of shots, as the camera processes the last image. Digital camera flashes also generally charge no faster than those on budget-priced film cameras, and so flash shots generally take even longer to cycle. If you're a high speed 35mm user, this will annoy you. If you're a medium-format photographer who doesn't mind waiting, it won't.