The typical SALT approach and service for young children with speech delay is certainly generic. A very wish washy overview, which is often (ime with 3 different children, and SALT services in 3 different counties) delivered in a patronising way.
My youngest had his SALT assessment yesterday. He initially (at 20 months) had a speech delay, but quickly caught up. He is now rather advanced wrt speech/language. He also has ASD, and has significant issues with communication - he finds it impossible to even contemplate talking to people outside the family, and can hardly bear it if they talk to him. Clearly not a good state to start school in.
So, despite the therapist yesterday knowing he now has no technical speech issues (I managed to coax him into saying enough to prove his), she still spent the hours assessment testing him to chart where his language skills are - off the scale, age-wise, as I am well aware - rather than probing his actual issues, and giving me advice to pass on to school (he starts in September) to help him out.
No possibility of a group therapy session to help with his social skills, as he is too high functioning speech-wise (never mind he can't use his skills!)
And so he has been signed off. My third child to be signed off from SALT services before school age, without anything ever being done.
My eldest had (and has) a severe language disorder - she had no functional language at all at age 3, when she was signed off from services because her problems were 'too complex', so it's not even as though you get help if needs are more severe!
OP, I would say that the most valuable things you can do to help your ds right now are to get hold of copies of the Hanen books 'More than Words' and 'It takes two to talk'. Hey are pricey, so maybe get your library to order them in? They are great resources to help you help your child. Because let's face it, not much is going to happen unless you do it.