I had to RMA my iPhone 11 as it was not working properly. Video on websites was choppy and the performance was poor. Now I do blame iOS 14 as being bloatware then again iOS 8 was a the start of bloatware with iOS, It has gone downhill since. The range of app on the phone has not changed much since the iPhone 4 was the hot phone to have.
Phones like the iPhone 5S run faster then the iPhone 11 which is of concern as the new phone has a more modern processor etc.
My old iPhone 7 plus is now in service as the backup. The battery is down to 85% which suggests it should be repaired if the phone will be returned to active service.
I still have the original iPhone SE in case the iPhone 7 plus becomes an issue.