Industrial scale electrolyzers exist now and are being deployed. The rest of the your post is just attacking strawmen. None of those problems exist at the scale that you think they exist. For instance, fuel cells are already lasting tens of thousands of hours, so they are well past being durable enough for cars or other vehicles.

We are also not discussing the viability of EVs and hydrogen cars right now, but what will happen in the future. After all, the start of this conversation is about Toyota somehow missing the boat on EVs. But people are forgetting that EVs are not the final step in the evolution of cars.

In reality, people are just repeating similar claims against hydrogen vehicles as people in the past have against EVs. The problem is that EVs have their own fundamental weaknesses that will probably never be solved. Those weaknesses will eventually require an alternative, of which the most likely is hydrogen. In that case then, Toyota is not missing out on anything.