I think the 3.3.5 client became so good overnight and has no bugs, right? What kind of statement is that anyway? Of course something gets better the longer you work on it to optimize it. But that's exactly the point that everyone agrees on. Wotlk Classic would of course require a lot of work but that's the way it is.
It's nice if you're happy with the old client and therefore 32 bit, but there's no real alternative. But there are also many people who would be happy about 3.4.3. In comparison, it has many improvements that correspond to today's standards.
That's why I mentioned before that other projects want to give their players the opportunity to decide whether they want to use the old or the new one for exactly this reason.
Or why has a project created the possibility of playing on his TBC realm with 2.4.3, 3.3.5 or 2.5.2?
In another example that is only a few days old, another project has managed to give its players the opportunity to play on their Cata realms with 4.3.4 or 4.4.3.
Regarding your previous statement that there is no project that supports Classic, which is also completely wrong, I would recommend that you find out more. On Reddit and other sites you can quickly find that it already exists.