I don’t claim to know how Harry’s mind works, but given his childhood, and constant hassles with the press, I am not sure that his insistence on his children’s titles is about giving them the possibility of living a royal life.
I think it’s far more to do with the fact that within the Royal Family, where the demands of the institution often take precedence over emotional closeness; titles, status, allocation of security detail all equate to “how much am I loved and valued?”.
Sorry for the armchair psychology but you see similar hurt expressed in families where the parent for whatever reason, has not left equal inheritance to their offspring.
It’s usually always a bad idea! Even if one adult child is in bad straits financially and the other is thriving, because the money isn’t just about money, it represents love and “how much I am valued by my parent”.
Harry is an adult now so needs to accept things as they are, and work on doing something worthwhile for others, but if you have had a childhood rattling between boarding school, your parents’s many homes, your grandmother’s estates, with lots of foreign trips thrown in during the holidays, especially when you are aware that you don’t “count” as much as your brother, then I can imagine that it doesn’t lead to feels of enormous self worth or security. And that’s leaving aside the loss of his mother, Hence his need for titles for his dc, and the big deal about his security ranking, because sadly, within the RF, it’s those things that determine and demonstrate your value.