Liverpool didn't add much because they built a solid foundation of a team that was competing for the and title and wasn't losing key players. Plus they filled a hole with Adrian as you mentioned. It may not have been a huge add but fixed the issue they had with Karius and Mingnolet previously.
We were a team that had fallen short, lost many key players and starting to show signs of dropping in form.
Trying to compare the two teams is laughable.
And I am fine if we are going the youth route. More than fine actually. Bring in players like Florentino Luis, Camavinga, Bellingham, Benrahma, Eze etc. I would have no issue seeing moves like that. i can see the ambition in adding and developing those types of players. But we aren't even doing that.
We are bringing in ok level players that maintain us at a top 6 level but don't give us much chance to move up the table or become more competitive.