回复：到底该不该申请AP和EAD？

Yes you should apply EAD and AP.
You don't have to use them. If you use EAD, you lose your H1 status. If you use AP, you can keep your H1/F1. Technically you can't have H1 after you use AP but many people are doing this and still hold H1 status.

If 485/140 is refused, you can renew EAD based on motion to reopen the case, or you can pick up the rest of your 6 year H1B, excluding the time period you have used your EAD.

There are no crystal clear rule/bill/memo for this issue, but people are doing it everyday.