It depends on who their target audience is. VMware for example have strict hardware compatibility lists because their target audience is big enterprise. But Synology being a consumer NAS, this decision was perhaps not wise. They're sort of standing in two markets. They need to make a decision as to which products are enterprise and which are consumer.
I don't think any enterprise clients would mind a strict HCL.
Evidently profitability went down due to the change, so if anything they were fighting for their jobs by opposing it. (If it is indeed true that they were opposing it internally, still not sure where exactly that claim is coming from.)
