You're right. Macs have excellent build quality and are durable as hell. Planned obsolescence with Apple is seen more with iPhones. There was the recent story about Apple slowing down older iPhones via software updates [1]
This isn't a case of planned obsolescence. If anything it's exactly the opposite of that, trying to prolong the useful life of a phone as its battery degrades. This did of course lead to them offering a $29 battery replacement for affected phones (after they were caught doing this).
The lack of communication was a problem but "planned obsolescence" in this case is just tin-foil hat nonsense.
[1]: [https://www.bbc.com/news/technology-51413724]