i think it almost certainly will accelerate hair loss if you have MPB, my T has barely risen since starting treatment and even i have noticed the difference in hair loss.

Yes. I don't have a family history of MPB, I've been taking T after a doctor recommended it and my hairline started noticeably receding within 6 months.

Why not take finasteride as well to offset it?

None for me at this point, but pretty early in the process