You focused mostly on additive bloat, there's also multiplicative bloat in the form of multiple teams focused on building separate versions of the same product to increase likelihood of success and empire building where leaders don't actually have a remit large enough to support the team size they have, but they have woven a narrative that defends the necessity nonetheless. Put everything together and teams are very easily 6x+ larger than they absolutely need to be to get a product into market.
You focused mostly on additive bloat, there's also multiplicative bloat in the form of multiple teams focused on building separate versions of the same product to increase likelihood of success and empire building where leaders don't actually have a remit large enough to support the team size they have, but they have woven a narrative that defends the necessity nonetheless. Put everything together and teams are very easily 6x+ larger than they absolutely need to be to get a product into market.