My experience is of one. But do an internet search. A-1, Ae-1, T series all have a high failure rate with shutters and giving error codes..
Neither of these cameras are able to give you
ANY kind of error code save for perhaps the T90. So your internet search brought up some tales or stories that can be readily dismissed.
You should take a second look at the things you are reading on the internet. "High failure rate with shutters"? What kind of wild fantasy is that? The shutter in all A-series cameras is mostly the same and extremely reliable, an extremely proven design made from 1976 to 1985 and present in dozens of millions of cameras. I've yet to find an A-series camera with an actual shutter failure.
Same for the EMAS shutter in the T70: a reliable shutter. The T90 suffers from degraded foam that can cause problem in the shutter. It can be repaired with no spare parts needed.
Moreover "T-series" means tying up in the same level three cameras that are very distinct in quality of construction and reliability: T50, T70, T80, and T90.
As for the A-series camera, my experience as a camera repairman is as follows:
AE-1 : Resilient electronics, tungsten wire tends to break rendering metering useless - a mechanical issue
AE-1P: Resilient electronics overall
A-1: Resilient electronics, many more switches than usual can get corroded and cause problems such as increased battery consumption -- usually an electrical issue. Also, tedious to disassemble.
all A-series: Mirror governor squeak caused by lack of lubrication -- a mechanical issue, lack of maintenance
all A-series: Shutter magnet dirty -- a mechanical issue, lack of maintenance.
Any of these cameras, as any other camera with electronic control, relies on
electrical switches that need to be periodically cleaned and adjusted to work properly. Something that is as easy (or even easier) as doing routine maintenance of a mechanical piece such as a speed governor.
All in all Canon cameras often have very resilient/reliable electronics. Your glorification of Nikon cameras is very funny, precisely some of the cameras with the worst reliable electronics i've seen are the Nikon EM and FA...