It has always been the case that the majority of the monarchs wealth passes to the heir. This is to keep the bulk of the wealth intact. This applies in other families irrespective of whether or not they have a title. Many farming families do this, but these days it may not be the eldest male but the best person in the family.
Managing big estates in terms of property and investments etc requires a lot of different skills as you can be responsible for managing £££ but more importantly the livelihoods of a large number of people. This includes employees, family members, tenants, animals, crops, historic items (paintings, jewels) etc. They are effectively huge businesses.
The RF will all grow up knowing the title and money go to the heir and they should be looking at how they earn a living. The heir will grow up knowing and learning how to manage the family business and the way to provide for other family members.
The Duchy of Cornwall was established in the 1300s specifically to provide an independent income to the heir to the throne. There are strict rules on how much of the income can be used by the Duke but the whole basis is to preserve the Duchy for future generations. KC has been managing the Duchy for most of his life and this included funding W & H and their offices. This is why H was miffed KC stopped his income when he stepped down. W is now the Duke of Cornwall and until he access to the throne he has the responsibility of managing the Duchy and will draw an income.
The Duchy of Lancaster was also created around the same t8me to provide an income for the Monarch. Again there are rules to preserve the estate for future generations. KC is also the Duke of Lancaster and now receives income from the Duchy.
In both cases the income from the Duchy’s can be used to fund day to day living for who ever the Dukes choose to support but also enables them to build personal wealth.
KCs accession to the throne wasn’t just about titles, two huge businesses effectively changed hands. Both KC and the PoW are doing what any new CEO does by reviewing assets, income and expenditure. Hence crown estate grace and favour properties and ‘salaries’ for family members are being reassessed based on current need.
Any information in the media is either guess work or based on leaks/gossip from disgruntled family member so are not likely to be balanced in terms of context and the full facts.