Due to technological advancements, internal storage is now much faster than memory cards. Hence, there is no use in providing a slot for slower cards. Secondly, they remove less useful features to make space for other components.
Regarding chargers, it's all cost-cutting. I think every company should offer the option to include a charger when purchasing the device. But anyway, due to PD technology, one charger can now output different wattages and fast-charge many devices.
