Superzoom lenses can be useful in that they cover a huge range of focal lengths without the extra weight and bulk from carrying a bag with lots of more specialized lenses. For landscape photographers, they can be especially useful, and this great video discusses why you should consider adding on to your arsenal.
Coming to you from Nigel Danson, this excellent video discusses the usefulness of a superzoom lens for landscape photography. The downsides of a superzoom are that due to their extreme focal length range, they are generally not as sharp as most specialized lenses, nor are their maximum apertures as wide, but given that landscape photography frequently uses narrower apertures than other genres, the need for wide apertures is diminished, and sharpness is improved a bit. And of course, the real benefit is the access to a huge range of focal lengths all in a single lens, making it far more convenient and less tedious than carrying multiple lenses. I was personally never fond of superzooms, but I've grown increasingly fond of them during my pandemic walks and have now purchased an RF 24-240mm f/4-6.3 IS USM lens that has become the default lens on my camera. Check out the video above for Danson's full thoughts.