The heir and spare cycle is really toxic and we've seen the same patterns play out over three generations now going into a fourth.
In every generation, the heir is the important one and the spare exists to protect the heir. In every generation the spare is given a negative or scandalous media persona so the heir can be portrayed as whiter than white (and every generation, the public genuinely believe these media personas are real and an accurate reflection of the real people!). In every generation the Palace allows or even encourages the press to print bad stories about the spare while trying to censor anything bad about the heir. In every generation the heir has a sacred purpose while the spare drifts purposelessly. In every generation there is discord between the heir and spare.
Princess Margaret had a wild child persona pushed on her by the press since she was young. She couldn't marry the man she loved, wound up going through a divorce, life beset with scandal, never really accomplished anything, and ended up an alcoholic and seemed bitter.
Andrew's life has been beset with scandal, money woes and failed business ventures, and now he's widely regarded as a rapist. Edward struggled and had scandals for years, failed military career, failed theatre career, failed TV career, filming William at university scandal, Sophie fake sheik scandal, personal life rumours before ultimately settling for a life of dutiful royal engagements that avoids scandal by being too dull for anyone to take interest. Anne's the only one who escaped the curse of the spare and the only one who actually accomplished something (her horse riding career) for herself.
Harry everyone knows about.
You can already see how it's beginning with a fourth generation. The Cambridges are still young children yet the media are already creating personas for them, and the family trot them out whenever they need a PR boost or are fighting some scandal. The tabloids always portray George as preternaturally mature, serious and well-behaved, while Charlotte and Louis are portrayed as the naughty ones (often with euphemisms like rambunctious, mischievous, energetic, over-tired, through earlier this year a tabloid literally printed ie made up a story with the headline "Charlotte is the naughtiest of all the Cambridge children"). Any time the younger two don't act like perfect robo-children the press jump on the chance to write lots of articles about how naughty they are, that doesn't happen with George. A reporter was even asked to delete footage and not report on George saying he wanted Djokovic to win. What will happen when Charlotte and Louis are teens and start dating and going out? When they have to start choosing their careers and life paths? When the Palace start leaking scandals about Charlotte to protect George? When Louis has to decide between supporting his brother or following whatever his career passion is?
They need to find a way to stop that and protect the spares and not have so much divide. Harry talked about needing to break the cycle and got mocked. In 20 years will Charlotte and Louis be working privately towards meaningful careers and lives, or will they be the new tabloid whipping boys?