In my experience, generally Salesforce takes a little while before they notice that they bought you and start imposing uniformity and forcibly regressing you to their mean.

This was a(n internally-)famously hard and lengthy process for them with ExactTarget (read: Marketing Cloud) because ExactTarget employees identified strongly with "ExactTarget orange" culture rather than "Salesforce blue", which mostly meant being appalled at the technical and process swamp that Salesforce represented and pushing hard to keep their own tech stack and their own culture and standards as long as possible.

Heroku had an interesting arc, as they were the bright spot people would point at internally as where actually good engineering somehow happene even at Salesforce. There was a whole effort to let Heroku be the business unit that paved the path to AWS and PaaS for the entire company (which was at the time operating datacenters themselves), and so Heroku got a bunch of investment and freedom for a bit.

Then there was some weird power struggle, and the executives inexplicably decided not only to take that out of Heroku's hands despite their expertise, but also to basically shove Heroku in a corner to be ignored unless stripmined of its customer base through upsells or its staff through reallocations of headcount.