Toyota hybrids are full hybrids however, not mild hybrids like other manufactures, so all you really need is a bigger battery and charger. My 10 year old RAV4 Hybrid (not plug-in) can deliver 160kW just from the electric motors, without the engine. That's 3x a Dacia Spring. They have the technology for motors and control electronics, and they know it works long term without issues.

Most of the European EVs are basically just electric city cars, unable to drive long ranges due to small batteries and limited fast charging. And most of them after 100,000km will need a new battery. Doesn't really fit in with Toyota's 'long term reliability' stance.

I can't blame Toyota for waiting for the technology to mature before they go all in on EVs. Plus they do have the bz4x / RX which are full EVs you can buy today.