And better yet, the T-series are practically just a reincarnation of the now fully retired H-4, H-5, and H-6 train cars but with better operational features. Such as wider doors, the removal of ceiling to ground poles presumably for easier accessibility. They did however make an error in not attaching metal handles to the ceiling bar which the Toronto Rocket fixed. But other than that, I've always liked the T-1 more.
I do commend your thoughts of accessibility, as that is an after thought often. But even so, accessibility on the Toronto Rocket is still a tricky maneuver. The actual train door frame I believe is higher than the platform. This is probably a fault on the part of Bombardier and the city, but it's rather funny (not in the amusing way) that the solution ended up becoming worse than the problem.
https://www.thestar.com/news/city_hall/2011/09/25/wheelchair_users_cant_always_roll_onto_the_rocket.html?rf
Going from car to car, this is a significant difference in rider behavior between both cities, but never in my life have I seen anyone walk between cars in Toronto. At a station or while the train is in motion. This is clearly illegal on the MTA but people still do it. The legal way to switch cars is to do the "mad dash" at the next station that I spoke of.
As for panhandling, a great frustration is that the TTC does absolutely nothing about it. In Toronto, the underground city known as the PATH, when making the walk through the various lower concourses of the buildings, you almost never saw any panhandling or eccentrics down there, because security got them out if they started. Indeed Toronto's PATH, at points crosses through the non-paid area of subway stations (specifically Dundas, Queen, King, St. Andrew, and Union) to connect to other buildings, and in these sections, yup, you always see those with their cardboard signs or freaking out or whatever even if you only have to walk about 30 feet in TTC property.
Indeed while it is a city problem, open gangways just allow for more annoyance from unruly passengers. Yes, anyone can follow you into the next car, but now there's no escaping an undesirable situation completely unless one gets off the train and waits for the next one to come.