From user_egieu1zx7o38ws5p:

• The Battleaxe lacks the blocking function like the 1.12.2 port from 2019.
• I preferred when the musket had a 2 part reload sequence like in 1.2.5. [Note to self: maybe a config option might be good to switch to it? Is it even possible to port?]

The battleaxe is working as intended - the blocking feature actually stemmed from the fact that ItemMelee extends ItemSword.
So, this "feature" was intrinsic!
However, I don't want to excessively change Vanilla behaviour by adding back features that got removed during the 1.9 combat update.
So, I will not actively re-add the blocking mechanism to >= 1.9 versions.
However, when I am eventually done porting to old versions (see #2), I will be more than happy to support it again in these versions!

The battleaxe blocking feature is now implemented as part of 1.21.0!
It is only a cosmetic change (as it will not block any damage - AFAIK!), but still, I am quite pleased with how it turned out :)

The 2 part reload sequence is rather hard to port, but let's see!