I would expect significant growth since 2018 due to Apple launching services like Apple Fitness, and further growth in Apple Music subscriptions, even if many of those services are given away free with purchases, much like Apple TV. It all adds to the figures and growth. Then again, most leading tech manufacturers have seen significant growth in the last 5 years, especially the Asian companies.The Q3 2023 iPhone revenue decline might be more meaningful if it wasn't compared against a RECORD Q3 2022 number. $39.8 billion is still quite impressive and nearly 33% higher than five years ago (Q3 2018).
The only time I take an interest in things like this is if it has any effect on me abnd right now I'd like to see the prices of everything come down, much like inflation has in recent months.