ok I don't believe they were telling you the whole truth when they told you it was purposefully this way and not a bug. i have been working at AppleCare (Apple's phone support) for years, until relatively recently, and i have seen former colleagues do this: give the caller a wrong answer with conviction to make the issue go away.
let me recap the issue we're discussing: in iOS 10 and later lyrics were meant to show right below the album artwork, but before Up Next.
see a description here: View lyrics in Apple Music - Apple Support
however, this never worked perfectly, it was not showing the lyrics to some of the songs. and every update made it a little worse. it was showing lyrics this way maybe for half the songs or less, but in iOS 11.x.x it shows lyrics for none of the songs
now, if the specific AppleCare advisor or senior advisor that you spoke to told you that they temporarily did away with this feature, because they're trying to figure out what to do, i might believe it.
but i can't believe this complicated way of showing lyrics is the way Apple wants it right now
therefore, i think they gave you a half truth to make you go away