Tigerboy can speak. We have sentences. Prepositions even. He’s not always very clear, I suspect a lot of it wouldn’t be understandable outside the family. (Sometimes it isn’t within. )
There’s a deliberate time to it. Each word is pronounced separately, with a pause between them. But today we had “ice cream on top” and “milk in cup NOW” and that now is an imperative.
It actually seems to have increased his frustration in some measures. When he had no words he’d written with you to get something across, now if you don’t understand and react immediately he collapses in a sobbing heap.
Just another phase. I’m sure we’ll get past it.
Overall, speech is a good thing I think.