Apple software is still top tier when you start comparing to Slack, Teams, and all the non-native friends. Apple Music does not take close to 1GB of RAM. There are very few native applications these days because of the cost. And lower cost availability is based on the web stack and lower entry level of skills.
MacOS may have bugs but in general they are well engineered. Starting from secure enclave that none of the competitors have, or just raw performance and battery life that is not just hardware. I haven’t seen a single bug in my Watch for over a year. I guess it depends what you use.
The most bugs that we see these days are originating from the choices behind the tech stacks. Python and pure JavaScript are still too popular. Every post here with Rust name on it gets attention because of its promise of some level stability reduced resource footprint.