This is something that I think a lot of people miss. There is for sure a reason why google has that toast. One shouldn't just dismiss what the big tech guys do in terms of UI because they are among those who have the most resource to spend on it, and also the most amount of users. So for them it makes a lot of sense to spend effort to cater to people with various disabilities, as there is financial profit in there for them.

For a small regional golf court chain who want to build an online tool for reserving tee times? They most definitely won't have the budget to do things entirely properly.