I disagree. Lapping ways by sliding the saddle back and forth induces more wear to the middle of the traveled portion than the out side areas. This depression ends up causing a looser fit in the middle and tightness at the ends. Premature wear is the result of lapping. Hand scraping is HARD. it takes real effort on top of craftsman diligence at checking and rechecking progress. I don't have the strength for it. Being disabled I chose a different method of bringing the ways on my X2 to a better finish than the raw machined surfaces it came with. I used a knife profile second cut mill file.
The smooth flat surface of a second cut mill file lets you lay it across the entire surface for a full engagement. The knife edged profile allows the file to get right into the root of the dove tail so you can scrape/file the entire surface. Indiscriminant filing will cause worse damage to your ways than using lapping compound, so you don't go crazy and just file away. You want to check the surface just like you would when hand scraping. I like that an 8" double cut knife edge mill has a little flex to it. You can lay it flat, raise the handle just a little bit, then use your other hand to apply downward pressure as you slide the file. Because of this slight flexibility you can address problem high spot areas without over filing a lower area. Yes, it takes craftsmanship to file in the right areas, constant checking to find those areas, and knowing when to stop, but it is more precise than lapping, and easier on my disabled hands than scraping. My X2 is very smooth across it's entire range of motion now with no tightness anywhere with properly adjusted gibs.
If I could, I'd hand scrape. I can't so I precision filed. Seeing the surfaces after lapping turns me off to the entire process of way lapping.