I own a Tesla, but I'm not a fan-boy. I can appreciate how having fewer ECUs means, all other things being equal, it would be less failure prone. (But more expensive to replace a failed larger ECU than a failed smaller one). Tesla starting from scratch gives them a lot of advantages, not being tied to a specific legacy architecture or vendors. Again, assuming they actually do it right rather than bodge it :)

Sandy and the other experienced gentlemen in the video are welcome to strong opinions about one approach being better than another; it's not necessarily biased. Maybe you favor a "simpler" design, or maybe you favor one that's cheaper to repair, or uses a tried and true architecture, or more off-the-shelf components.

I actually just had a steering wheel module replaced in my Model 3 last week; the Park button had stopped working. Of course these kinds of things are electronic in virtually all modern vehicles.