The hollowness of the grind is more of a preference issue. It won't effect the shave or hair type as previously stated. Some people prefer a stiffer blade so the wedge is more what they would want. Some like a light, more flexible blade so a hollow would be more their pick. It's a different feel but they will both shave equally as well when shave ready. The one thing is that a true wedge hones a little differently because more of the blade face contacts the hone. Also it will often have a wider bevel. I always use tape on the spine regardless to minimize hone wear. There is a school of thought that the edge and the spine should wear at the same rate to maintain the correct angle but if you hone correctly it will be a long time before that becomes an issue. Also there are tricks to it that make the edge more durable preventing the need to hone as often but now we are getting into more advanced honing techniques. If you're not proficient at the basics then that just becomes background noise.