To me I believe it's good and necessary to have at least 40 or 50% of your team squad be a star and high profile player.
The presence, skill, talent and experience that a star player will bring to a club can't be compared to anything.

That's why I prefer to have a team with star players, youth or academy graduate players, so that they can both learn and grow with each other.
In football no matter how talented or good or big you are, you still need that hunger to keep you going. That's why a ayer like Ronaldo, Messi, will always have a positive influence in a team. Plus when they play with young talented hungry players, they can both push each other to new highs.

Of course having a star player in your team can go two ways, either positive or negative.
An example of negative is Aubameyang who became arrogant, lazy and starts losing focus just because he thinks he his un touchable or changeable in the Arsenal squad. Now that he his serving his punishment, the likes of martinelli are stepping up quite well in filling his shoes.

An example of positive influence is when Zlatan ibrahimovic went to LA Galaxy in USA, immediately he got there, there winning sense and fighting mentality changed. Although he might be controversial in his ways, but he still had a good influence on the team and player in helping them increase their standards.

So it is good and necessary to make high profile signing but it must be well managed and not overly done. Thank you.