A study of device repair in Germany for the year 2019 found that 30.7% of those conducted by users were carried out on Apple phones. Samsung was second in these terms at 29.7%, followed by Huawei at 21.6%. Owners were most likely to replace their phones' batteries by themselves, and to resort to a professional for screen repairs, last year.
https://www.notebookcheck.net/Apple-products-stand-out-in-a-study-of-mobile-device-repair-in-2019.450017.0.html
My replacement motherboard is arriving tomorrow. The greatest challenge to DIYing this is to open the back panel, which I already had somebody with a heat gun do for me...