I think that they use the regular snakes (except for Loomis) because 1 they are cheaper and 2 the people buying the rods are used to them.
And i don't think the normal client is looking at rod guides as we rodbuilders do. In the 4 years i assemble rods for the store where i work, only one client really asked about the lined stuff.
I assembled a Boron MX 9ft #5 for him with lined fuji titanium sics, at the time i owned (still do

) that excact same rod.
Mine has double H&H thin wire on the tip section (1 is the smallest) then switched to regular and two lined fuji CLSG's.
I used the same spacing and my rod did produce a faster recovery, but the MX is a pretty tippy rod.
I've build many rods with regular and recoils (singles and double) from H&H and Snake Brand, also with the lined Fuji titanium single's.
The lined guides are fine for my from a #6 and up. I think they look to bulky on a lighter weight rod i don't know the excact weight difference in both.
I never use them on rods of my own because i think they just don't look right.
I like the look of regular snakes don't know why i just do, i almost always use snake brand or H&H. When i do a lot of bank fishing i will use H&H (because they are american style guides).
The recoils i use are for the very lightweight rods that will never see a sinking line or a lot of extreem double hauling.
One thing i must say about the recoils is that they improved my Winston BIIt by a mile when compared to the factory build (wich has the old style Snake Brands).
Jerry