The only Classic thing about Warcraft III is the standard graphics which you can access even if you have Reforged. The issue is only that you can't buy only the Classic/Standard part of the game but have to also buy the incorporated Reforged/HD graphics part.
Since ladder-wise the two are cross-compatible, the servers are for both, on.
Regardless, people prefer other non-official platforms due to better experience and features and fewer bugs.
As for updates, we're currently at patch 1.36 which isn't without bugs, especially World Editor related ones.