Places I've worked that actually seem to have inclusion as a core value are great places to work and seem to have high functioning teams. My impression mostly though is more that it was never really a value for management but they wasted a bunch of time talking about it. In general any mismatch between stated values and actual values has been awful to deal with and is a red flag for places to work.
That's the thing - you can have it as a lived value, or you can have HR run programs. Very few places have/had both. Given the choice, I'd pick door #1.
(Saying this as a strong advocate for diversity and inclusion, lest there's confusion)
There are two ways to do diversity - the first is to put a brutal skill filter and take everyone that passes it no matter their skin color, body weight, religion or politics. The other is to reduce people to their demographics and push for (in)visible quotas. One of them leads to crappy results.
> Places I've worked that actually seem to have inclusion as a core value
I am not sure if you had implied it but that would align with my experience as well: places that tout diversity were the worst places to work (as someone who is seen as 'diverse') while the ones that treated everyone the same and had the expectation everyone pulls their weight.
I absolutely despise people treating me differently because of who / what I am rather than doing good work. I will take mildly inappropriate good-nature jokes over head pats every day of the week.