Earlier quoted context omitted.
if you left right after the acquisition how can you even speak to what the experience has been?
I have found the experience very different than what the OP's experience is. As you know the layoffs that happened were around the same time as the rest of the industry layoffs were happening (fashion firing), I don't feel like it had a significant effect on the culture. I am fully remote though, and have been for 15 years.
A lot of what was communicated during the acquisition process was how IBM was going to super power Red Hat and help Red Hat grow into an even larger entity, and how Red Hat actually need IBM to survive.