Analog film photography and cameras

As mentioned above Canon autofocus SLRs seem to be abundant and dirt cheap, is there a caveat to them that I'm missing?

The caveat in your instance would be that they use a different lens mount to the FD lenses you've used on the T70. EOS SLRs use the EF mount, so will mean buying new glass.

Otherwise, some people don't like them as they prefer manual focus and the heftier build quality of older SLRs. Using an EOS film SLR is perhaps more similar to a modern DSLR than it would be to an older manual focus SLR.

I like auto focus SLRs as they're dirt cheap, get better image quality out of them and they're generally more reliable (as they're newer).