Kind of a typical response, but my android's custom os. I think the OnePlus 8t is fantastic, BUT specifically thinking of the custom rom (Nameless13) I installed on it to replace OOS

I'm not that old, but I still came from flip phones and nokias, so the amount of evolution is incredible

I like this custom rom so much because as a tech savvy user, I can have it do whatever I want. It has an insane amount of QOL features, fantastic support team, better battery life, better responsiveness and energy usage, frequent and reliable updates, devs pushing out good features that users actually want, no bloatware ads or BS, a ridiculous amount of options and customization, and full control. The only single drawback was the stress and effort of learning how to install a custom rom, but it felt extremely rewarding and as someone in IT, it's something good to learn. Plus having super nice and helpful support team and users both, made it way easier

Or, as a market-based solution: TurboTax raised the price for small business returns to about the same as hiring and accountant. So, now I just hire an accountant.