Every person is a self governing individual part of a collective whole.
Autonomy (self governance) is one of our developmental milestones. Autonomy is naturally part of our human development. So is our bonding, belonging and connection to other human beings. We are social animals. We all need to be loved and nurtured to survive.
Balance is important. The four fundamental forces of nature keep the universe in balance.
If balance is so important, it stands to reason that the individual is equally important as the collective.
So, going from one extreme to the other is not going to be best for all of us. We will not thrive or do well in either extreme.
I agree with the sentiment of the pp you quoted who asked why can’t we have both. We can have both. We can value the individual and the whole of society and life on earth and value the universe.
And as for what definition of individualism do you have in mind, that is a good question. There are different versions of individualism and it can vary in different cultures. How France or England or the USA view, interpret and implement individualism differs.
There are also different versions of collectivism.