Yes the new Library/Search/Favorites GUI is written in Flex which requires Flash. It is a complete rewrite of how the library works. It is massively mutli-threaded and can do extensive work in the background, unlike the old library module. The old library easily died with 500 GB in runtimes, this one can handle that even in a single runtime, and doesn't make you wait for it to catch up. It also remembers what you're interested in, and will do more to become adaptive to your habits in the future.

There is signficant benefit to the technology chosen. Pros and cons were weighed. It isn't like this decision was made by stupid people for stupid reasons, despite what so many opine. Plus, the ultimate goal of the library has not been revealed, so anybody giving their opinion about the decision is working with incomplete knowledge, which makes the opinions irrelevant.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)