What's the difference between MAX HARQ, HARQ DL or UL?

So if less RLF are happening, can we reduce HARQ process too for throughput improvement?
Same like RLC retransmission for drop cases?

For Throughput improvement other way round to increase dltargetbler.
In trial improvement seen in kbps.

Which has more BLER issues in general - TDD or FDD?
I believe FDD, correct me if I am wrong.

TDD you find more BLER issues due to more prone to interference technology.

BLER target increase will help in FDD mainly.