The driver was jailed for 10 years so I don't get your point; the behaviour was already illegal since the driver was not paying attention and wasn't in control of his vehicle.
https://www.ashmanssolicitors.com/blog/have-you-been-caught-...
Re the case of the lorry driver: There was video footage of him browsing his phone, he killed 4 people. This isn't normally the case which is why many people think it's OK to drive whilst distracted by their phones ('multi-tasking' is the phrase I think they often use?).
If laws around usage of mobile phones whilst driving were tightened up and rigorously enforced from the outset then it is less likely such a tragedy would have happened.
This was my point. As well as a gentle reminder for anyone who thinks there are never going to be serious consequences of doing similar.