The real issue is that there's a glass ceiling at around F3 level and that women are trying and failing to find funding for the next step up. Alice Powell is a good example. Clearly very quick but unable to put a budget together for anything other than regional FRenault series. Her time in GP3 was way too brief for the talent she has but the money wasn't there to carry on.
The winner of W Series gets a very healthy budget to make that next step up. That's what a driver like Powell needs. Once you get drivers graduating to and performing well in F2 or Super Formula via W Series, it shows potential sponsors that they wouldn't just be wasting their money by funding a woman. And once you break down that barrier, you become less and less reliant on the "segregated series".
That is a statement that can be said of most racers wanting to step up in the higher levels of motorsport, not just women/girls. There will a lot of people racing in the lower series that would love to move up but cannot afford to do so. There are also a lot of people who struggle to maintain budgets to continue to compete at the level they are already at.
The barrier in motorsport is and has always been money. Racing is an expensive hobby to take part in, if you can't put together a budget to allow you to do it then you are not being discriminated against or hard done by. No one has a right to race, no one has a right to other people's money to allow them to race. You have to fight for your chances and if you don't get them, tough.
How do you think that this is going to work in the real world. This series is doomed to failure,it is only going to haemorrhage money as it has no control of the environment outwith itself. Sure they may have minor successes by using the money to fund a racing seat in another category, but unless that girl/woman has the adequate talent and the ability to come up with a budget for herself (something that W shields her from), her racing career won't last for long.
If sponsors aren't prepared to spend money on a driver when they are competing in a competitive series that is well-established, why would they be willing to spend money on them after they have been in the W series, a series which lacks credibility and won't provide a representative example of the women's ability in a more competitive series?
W can gift some women/girls female privilege, but outside of that series, they are just another person competing for a seat in a racing car. Another person that has to provide not only financial backing but also the ability to get results. They need to do something that makes them stand out. W will make them stand out for all of the wrong reasons.