My 4Runner was in the shop for some upgrades and I had a loaner for a few days. It was a brand spanking new Rav4 hybrid. I think it was 2nd from the top in terms of trim. Had everything Push button start, TSS, and a pretty sizable screen for the dash. With the exception of key-less entry, I didn't care for anything else. It was nice to be able to just walk up to the car and open the door without fumbling for the keyfob to unlock. But other than that, everything else was annoying. Every time I was parking or driving in a tight space, beeps were going off everywhere. The Rav4 thought I was too close to the walls, other cars, etc... Even the lane departure warning was beeping at me. Eventually I figured out how to turn off all that, but going back to your question, if it were me, this would negate the reason for getting the 2020. Why pay for TSS and not use it? As for the 8" screen, you can always just upgrade the head unit to an aftermarket one. I personally swapped mine out for a Pioneer but if I were to do it now, I'd go for the Alpine 9".
Anyways, good luck in your quest!
So, I haven't had these annoyances in a Tacoma with TSS, or a Lexus RX450h. Is TSS an inferior system to Lexus' LSS? I'd assume they'd be the same, but the Lexus is my wife's daily which I do cart around sometimes and it seems mostly non-intrusive. I drive the Tacoma on the weekends and take it camping and off-roading, and don't have any qualms about TSS.
The only times the safety systems have really pissed me off and given me a scare are with the Lexus and it's BSM emergency braking, it's so stupid sensitive that if I'm backing out and it senses a pedestrian coming from behind me 100 feet away it'll slam the brakes, giving me a heart attack in the process. Other than that I feel all the other features work as they should.
From what I saw on the other forums particularly is that some people drive like *******s and don't realize it or want to admit it. Some guys complain that the adaptive cruise control leaves too much distance on the closest setting, which means they typically like tailgating without it.
A hit or miss feature is the proximity sensors when parking, some of us might are pros at parking already and it's more of an annoyance to have it beeping at you while you're trying to park, but I think there are quite a few out there who could use it, but probably won't and will continue to park 10 feet out of the spot, or diagonally, or too close to my car. Worse are the people who have the sensors and still can't park for the life of them!
I can't really say I remember having many issues with lane departure assist, except that it has gone off when I've underestimated a curvy road and gone over the line, veering slightly into another empty lane. On the Lexus particularly it's excellent about telling if you're changing lanes, or just swerving/veering. Now, I don't know if that will be the case for the 4Runner, but if it is, then I truly think it's nothing to worry about.
Full disclosure, I could live without TSS and it's not a main selling point for me for the 2020s, but I don't think it's necessarily a negative. Adaptive cruise control is nice, but I wonder if that will need recalibration after a lift, and if they'll charge for that service. I really hate the sensor box as well. The other upgrades, though not many, are welcome. The new gauge cluster is nice with the individual TPMS readout, and so is the bigger touch screen infotainment system.
I think the bottom line is, most drivers suck, on road and off road, because they think everyone else's driving but their own is bad. Some of those who are vehemently against safety features could really use them for the safety of others, but it's just that, they'll ignore them even if they had them. As humans we don't like being told we're wrong or admitting we're at fault, it's just our nature. Sometimes that means safety features that work as intended make us unhappy.
I'm ambivalent towards TSS, I think the 4Runner is great with and great without, you decide what's important to you.