Every builder has his own techniques, and these techniques evolve as he becomes more experienced. It's called, "honing skills". Techniques may even change dramatically, but it's all in the good of better cues.
I often see people stumbling over builders' early cues, wanting them more than current models. But in my mind, i'd rather have a later cue that incorporates knowledge & experience he never even had when building the early cues. The one exception to the rule is the very, very few builders who began as passionate one man outfits but evolved into greedy assembly lines, or changed focus from playability to artistic expression. Don't get me wrong, lots of builders have become fancier & more artistic over the years, but the majority still kept playability their first priority. Bill Stroud is a great example. His cues began as pretty classic design playing cues that play lights out, to now infinitely intricate art pieces that still play lights out. Then there's the infamous production guru, no names needing written. He began building wonderful players cues, and was innovative in material & construction & design. But then came the factory, cheaper materials, sloppier assembly line work, and eventual loss of respect. That's one instance where the old cues are best. But this is rarely the case. Personally, I build better cues now than ever before, and keep getting better. Does that make my older cues junk? No, they were still the best I could do, but nowadays my best is better.