Anyway, if you rely on BitLocker in TPM mode (boot without PIN), you should know that anyone can steal your computer, sniff 32 bytes off of the LPC bus, stick them into libbde, and decrypt your disk. Yes, it's that easy. Solder 7 wires to $favorite_fpga_board, decrypt drive.
TPM 2.0 lets you set up a secure channel (which means you can still pwn it but you need a MITM attack). However, I do not know if BitLocker supports/uses that feature. It might well not.