A shallow tank is much easier to work in compared to a tall one when working with plants or trying to catch fish. Kinda obvious I guess. And for some people having a tank that is accessible from all sides may be an advantage if stretching and reaching is an issue.
Also large canister filters are heavy when filled and a pain in the butt to lug to the sink for cleaning, so I'd avoid those if I had issues lifting heavy objects.
Having a cabinet under your tank is handy for storing all your fish stuff so you don't have to be going from here to there for your supplies. On the other hand if you have problems bending then perhaps a tall cabinet next to the stand would be a better choice.
Long handled tools such as tweezers and scissors are great to have. I have a tweezers type tool that's 24" long and I use it for all sorts of stuff.
And YES - a python is the mother of all handy dandy fish tank tools!
Long scissors and long tweezers are magical tools to have. Even extra-long nets come in handy.
While I'm fortunate not to worry so much about restrictions or physical limitations, I find using dowel rods and long, rigid tubing in my deeper tanks to poke and move things around to be convenient. Imagine they would be helpful if you didn't want to put your arm into a deeper tank or couldn't but needed to gently move things around.