good n valid questions, heres the cut n paste of a preface to a research piece Im writing on them:
I love them but I wouldn't recommend them for everyone. If you took apart and
correctly re assembled your bike as a kid, they may be for you. Why me?
A few weeks ago I counted as best I could the number of estate pipes for sale, in online auction and e-commerce (eBay, etsy, others, 30+ EU Asian auction sites and 30+ major US/UK/EU sellers etc) There were +-40k estate pipes available. Sixteen were cigar-pipes.
I collect them more than I smoke them and I like them often for aesthetics, I like the variations, oddities, 100s of weird patented innovations/models, like "fire-proof" for smoking in your 1870 straw bedding, and the "hurricane proof" ones,... really? 'So we can keep on smokin' through a Cat 5 eye wall?' 'Absolutement!!!' 'We may die but there
will be tobacco'. Love it. I'd bet if Shackleton carried a pipe, it was a Zeppelin style.

L'Atlantide 'sparkless' advertising post card 1924
German sparkless bed-pipe ca 1880
L shaped pipes kinda bore me, and tube style pipes are the first smoking aids, not L90's, so modern variations on a more ancient style? I like that too. I absolutely Hate cigar smell but love aromatic tobacco and my 1928 DeBenedictus fuax cigar pipe. I love it's disguise.
1928 "Cigar Shaped Pipe' patented by Brooklyns own Sal DeBenedictus
Ive only seen a very few who really collect them and those who do are pipe makers, physicists and a biplane pilot who all ride antique motorcycles. Theres also almost NO information about the pipes even in period advertising, and Ive never seen even one listed on the thousands of shape charts I've looked over from periods during which I know the manufacturer was producing them. They seem estranged by their own makers, like a non-pipe. It frustrated me as a newspaper and museum career veteran, so now I collect the pipes AND information, which is even harder to find.
Theyre inexpensive usually too, I think, for how rare and odd some are. I have an Achille Savinelli Jr handmade one-off rusticated Zepplin from early 30s. Whats that worth if it's an L pipe? Prob a ton, why the difference? BTW, would anyone out there happen to have (or have even seen) the one-off smooth version he made ? : )
This folk art pipe is unique, made from a 1911-19 Remington Nitro Club 12g shotgun shell. Value,.. ? but its a priceless museum piece to some, to me. I'll take this over a gutta percha pistol pipe anyday.
They are definitely a different beast, have a learning curve and most do go out in 3 seconds because they're enclosed. Some smoke great others iffy, lose the Vauen's filter, not so bad now. They can burn out a hollow spot and be hard to relight. Open up, gently press down, relight,.. When tamped they can leak ash, be a bit messy, but once you know. The nose can get HOT and burn you, bad. Upsides include they can be preloaded, work great while on a motorcycle, in rain. They were designed for travel, 'motorists' and harsh conditions but NOT for use on airships, That's nonsense and except for the WW1 spy car and Hindenburg smoking room, smoking anywhere near a Zeppelin let alone on one, was very verboten.
I think all the little differences and the overpriced new ones turn off most people before the "oh, okay, I got it now' moment, and prob require a bit more hands-on than most give. Theyre also not a 2qt gourd calabash with an oz size block meerschaum bowl, Think shot glass, or perhaps a sprint car, not 72 Cadillac. Some though can smoke smooth and like a champ.