They can be beneficial, but you need to be smart about how you go about taking advantage of them. Because the algorithm for shorts is different discovery is far easier. You simply post a vertical format video under 60 seconds and it is eligible for the 'Short Shelf.' When it hits this shelf that is when you see a drastic spike in views.
Important Information Regarding Shorts:
1. The shorts shelf does not use your thumbnail. Instead it uses a screenshot from the video. Be mindful of this, and make your video quality/color etc as good as you can. It also warrants mentioning that your video is still a regular video and can surface on suggest, search etc. For these reasons it is important to plan longterm for them and make a thumbnail, do your keyword research etc.
2. YouTube recommends that you make your videos 15 seconds long. Because these videos are so short you need to aim for outlandish analytics in order to compete against other videos on the shorts shelf. I have seen 15 second videos with 360% retention fail. The most successful videos will garner multiple views. And even though you can do little to affect the CTR it appears that it does come in to play regarding the amount of time your video sits on the shelf.
3. You will not gain watchtime towards your YPP/Monetization goals, and you will not receive ads so these viral videos only add to your view count. They do nothing to help pertinent analytics and are largely for vanity sake, except...
4. Viral shorts will gain you subscribers. For this reason it is important to cater your content for people who are going to specifically enjoy your channel. The last thing you want to do is to post a hilarious short video about your cat doing a backflip on your Minecraft channel. Keep your content on point; this is a good opportunity to get a following.