The release date of the expansion pack is approaching.

There are no downsides, only advantages compared to SOD.
SOD is not a game, but a gamble – you either get lucky or you don't (except in cases where the difference in player levels is very large).
In TE, everything is closer to being balanced. Even under equal conditions, in SOD, Stronghold and Necropolis dominate...
As for the Slow spell at level 2, this is a correct change because Slow is significantly more dangerous and useful than Haste at the Expert level.
Other changes and adjustments were also made for balance (Fire and Water are now no less useful than Earth and Air, the overpowered Stronghold has been nerfed, the overpowered Necropolis has been nerfed, the difficult Human Castle has been simplified...).

I just like the Stronghold, and in SOD, I often hear that it's overpowered, but I chose it for a completely different reason...

P.S. I read the rules for the tournament that's currently running... haha... all Necropolis players participating in the tournament should be ashamed if they don't take 1st or 2nd place.