Awesome. I have probably dozens of posts over the years about why one would choose Oracle, so I won't rehash it all right here, but I'll link some relevant ones. Briefly though:
> in 2022 when we have equally capable or even superior open source alternatives
This isn't really true. Postgres is a truly excellent RDBMS, but most people compare it at a rather superficial level, because many use only very superficial features. If you need to insert, select, update, and delete, you have a lot of compelling options. (This can easily veer off in another direction, but I astounds me how many people shun the database and chose to reimplement innate features in procedural code outside of the database.) For example: Oracle has an extremely richly featured, powerful, and stable data warehousing feature set that has no open source analog.
A lot boils down to build vs buy. Some places build because it's exciting. Some don't even know that the thing being built has existed for three decades. This applies equally to open source. It's entirely possible that a materialized view will obviate your whole external caching infrastructure.