I for one think a practice mode while it sounds great would just take away from the stress testing goal.
If you had a waiting room to practice before the match, most of the players would decline every match for days destroying the OST.
The way it's been done is perfect for what's it's built for. Testing server connections between players.
I didn't get a code and I find it completely ungrateful to say the beta was made wrong. At least you have the capability to play and learn even if it's less than optimal you have that option.
What is important is everyone has access to content early and can stream and record this gameplay. This gives the community answers, knowledge and data to save which benefits the entire community.
We have threads listing combos, Krushing blows, wakeup options and many other things all ready.
You need to play 10-20 matches just looking in moves list until you get the hang of things.