@Riddler:
I think it's more than 6 now - the sequels to Ant-Man, Guardians, Captain Marvel and Black Panther were all added to the list recently, plus a potential/liekly Fantastic Four film.
No official sources have added any film after Love & Thunder as Phase 4. Feige was asked less than 5 months ago to clarify what isn't Phase 4 and his response was "no".
They either know what they want and there's a reason for not clarifying yet or they want to see how things pan out first. Most fans are just adding it to Phase 4, but I wouldn't say they're wrong or right for doing so. The editor for the Marvel site listed those films you brought up as Phase 4, but when asked, she couldn't confirm it anyway.
On a separate note, the Marvel Studios r/ mods keep removing "where were the Eternals for Thanos" threads. No matter what explanation is further given, people will treat it as "but Back 2 The Future Time says".
I find Endgame and WandaVision specifically interesting because many of the audience come away with grievances like "Steve Rogers messed up the timeline" or "but Reed Richards, Pietro, and Mephisto".
It's like Ace dying and someone saying, "but it was set up for him to be the new WB Pirates Captain". There's a disconnect here. People are even going as far as saying they won't speculate or theorize anymore. That's an extreme. Nothing wrong with expectations and speculation. It's the attachment and entitlement. The writers were very annoying the way they kept explaining time travel and I questioned why when I got it the 1st time in Endgame. After seeing reactions online back then and still til this day, I understand fully.