Apples/oranges: NewPipe is a full YouTube client that can download videos, whereas yt-dlp and its frontends are downloaders for a myriad of websites that include YouTube. You can, for example, download video from Twitter, Reddit, Twitch, etc. in addition to YouTube using yt-dlp/dvd/etc.

for someone who uses newpipe already it is of no use. but for users of the standard YouTube client. Downloading this application is better than downloading a full fledged yt client and video player for downloading a few videos off of YouTube