I would not use an expensive bike for that commute. An old but decent hybrid/mtb with no suspension and Marathon Plus tyres would do the job. Front dynohub ( compatable with your tourer) would be ideal.
Train commuting is quite a different "use case" to a bit of Euro touring.
Yes but it is not for that on its own but other uses as well. As well as cost there is a space limitation to owning one bike for every use so I have always tried to own one bike for as much use as possible.
The main use is commuting and local riding. Touring is a potential future thing and a compromise. One that I made when I toured on my current road bike from PX. I will never have space, money or inclination to buy a pure tourer as that is not my first, second or third use for any bike need. I added it as a throw on extra.
PS I do actually own a full on tourer, but it was bought for another feature. Namely it is a recumbent bike which is why I bought it, to scratch that itch.