These two technologies are problematic for several reasons:
- Not available in the village phase;
- Its high cost does not make sense;
- Is only researched in the city phase when your economy is already solid and the game is in your favor;
- Champion cavalry will be recurrent in the game again, so 10% + 10% can be op.
Patch removes the second technology and puts the first available in village phase, also decreases your cost considerably.
Patch is a good complement to D2955.