Hardware retrofit, yes.
Nav on autopilot is an Enhanced Autopilot feature.
Sentry mode: Eh, it's neat I guess but doesn't do anything for the driving.
Smart summon: Enhanced Autopilot feature.
Traffic light and stop sign control is the only actual FSD feature they've released. It's fine, and nice to see that they released *something*.
I'm not saying the car hasn't improved (there have been lots of improvement, and autopilot itself works MUCH better than it did 3 years ago), but ultimately I paid for the ability to have my car drive me places without me having to supervise, touch the wheel, etc. That hasn't happened and it's increasingly clear it's not going to happen within the next several years, and I'm already at the point where I'd normally sell the car and buy a new one. I'd like to get a Model Y, but I'm not going to buy FSD again since I've already been burned once, and I'm not going to buy without it because there's no way I'm going to *downgrade* from the feature set I have now… I am an angry customer and disappointed with a lot of things, but Nav on Autopilot and Autopilot lane changes are not something I want to give up.
Ultimately though the big problem I have is that Elon/Tesla has repeatedly overpromised and underdelivered, including outright *lying* to early FSD buyers about what they're going to do as penance for previous overpromising and underdelivering.