The big sign of Apple’s deterioration has been iOS 18. It is a disastrous launch with a terrible photos app, worse autocorrect, bugs, … on their flagship product. Hard to trust where they go from here. At some point it’ll affect security.
You're only now realizing this? Software quality at Apple has been in a freefall since Cook's appointment. If you sincerely think iOS 18 is the turning point, then I don't even understand what you use your iPhone for.
Apple became a service company. When they were making bespoke software to compliment their hardware, things were great. Then Cook was instated and it became all about margins. Good software isn't funded by Apple anymore unless it sells a subscription service or similarly low-margin recurring revenue.