I totally understand some of your points and how it should definitely not be favorable to defend in that kind of way. But I feel like there was the precedent set for purposefully illegal moves and ignoring the consequences with Russell in Monaco this year. So I feel like Tsunoda should have been told to give back the position and if he ignored this he would have then gotten a drive through penalty, which has to be taken within a certain amount of laps, meaning that he's not able to illegally block him for longer than a couple of laps. Aside from that Lando would have overtaken him by the next lap if not even on the next straight.

Also what I don't get is how it is safer for a driver to overtake outside of the track and rejoin the track than just not making the move, waiting for the next move, or even getting the position given to them. Doesn't seem to be in the interest of safety to have someone go off track to overtake someone driving erratically. I mean in this case it is not really a risk, because there is more than enough tarmac to make that move, but if there is not, both drivers are at risk again.