There are plenty of tall wooden buildings, some with wooden exteriors, some without. Wood doesn't actually burn all that rapidly, so it can be a safe choice in the right circumstances.

IIRC the biggest problem with the Grenfell cladding was the combination of flammable insulation + air cavity + flammable cladding. The cladding was not suitable to be used with that particular kind of insulation. Building codes are apparently pretty complex, but not without good reason.