Taxi speed has been a T!3DP pain point since day 1. I don't want to be confrontational but I would disagree that we saw faster ground movement in T!3DP. I spent more hours than I'd like to remember on this topic and the fastest taxi speed was only 19 kts. So, to be honest, a taxi speed of 25 kts would be a welcomed increase.
But, obviously an increase to 25 kts is only the tip of the iceberg when it comes to taxiing characteristics. I think the predominant opinion for T!3DP was that pretty much everything about taxiing was too slow - including acceleration (initial, after a stop/turn), runway entrance, exiting the runway (coming to a complete stop even on high speed exits) to name a few. But this is not news as this has been discussed for several years now and obviously mentioned in wishlist items.
So, to simply answer your question, a realistic taxi speed would be welcomed as long as other realistic and improved taxiing characteristics are part of the overall picture.
Thanks, Craig
PS - If you are wanting to slow something down - the pushback/start process would be something I would recommend taking a look at.