In the mobile layout, when you first open the artist page this is what you see:

The primary thing I want to do when I look up an artist is play some of their music. That makes the Shuffle button, Radio button (probably? never used it before), and list of music the most important content on the page. The artist's picture, and especially the description, is a lot less useful

The official YTM app on Android has a section at the bottom of the page titled About, where the description of the artist goes.

Some tweaks I made with GTK inspector, to show what it could look like:

• Made the avatar size 180 instead of 240
• Hid the empty/invisible "subtitle" widget
• Hid the description
• Made the subscribe button a normal flat button. Not an outlined pill