They are capable of and have done it in the past though.
In the past they have been good at adding layers within the constraits of character bloat and limited movie run time.
All the stuff with Ironman And Cap America was great as they stood on opposite current day political ideologies. Plus the winter solider angle in arguably one of the best movies Cap American 2 winter solider which lead into civil war.
Likewise the chemistry between Robert downy Jr and Tom Holland as a father figure to spider man. They dont actually have much screen time together but they share some of the best emotional moments in the series.
I guess I just miss Robert Downy Jr and Chris Evans who are incredible actors capable of lifting the material especially with directors in their prime like the russo's