It's marketing stuff, not at all a deal-breaker.A couple of Vivo smartphones like Vivo V20E 5G and Vivo Y73 have been launched with extendable RAM feature where 8GB RAM can be increased to up to 11GB using internal storage. Is it really as effective as real RAM?
The short answer is "almost certainly not". However, if the system doesn't have enough physical RAM to store everything it needs, virtual RAM really becomes essential. I would say it's not so much about whether it increases performance or not.