Not a dealbreaker for me at all. In fact, many high-end boutique builders stopped shipping their basses with hard cases because most people will receive it, take it out of the hard case, put it in a closet and then just use a good gigbag for actual commuting/practising/gigs (almost like it's in the name...) My Marleaux came with an awesome semi-rigid gigbag that's way more practical than a hard case - Warwick ship their Custom Shop basses in a leather gigbag (they used to ship them in full-on flight cases). So do Dingwall, Sandberg and most others you could mention. I think MTD have a hard case as an extra option on their US basses, but most people will skip it and be okay with the gigbag. It's just so much easier and more practical to get around, especially if you have one with the dual backpack-style straps. Most busy working pros will use a Gigblade or something for getting around, you won't see many of them lugging hard cases.
I have a HSC that came with my Stingray which is good for travelling by air and for storing it I guess, but more often than not I'll just put it in the RockBag I use with my Warwick (I'm on my third one - first two got worn out over the years). I have a flight case that I use if I ever need to check my Warwick or Marleaux in as hold luggage when travelling by air, but that's literally the only time it ever gets used.
When it comes to original, vintage instruments though, I can understand why people will demand the case as well - it's to complete the vintage, collector's item. Passing up on the 'best bass you ever played' because there's no HSC is a bit of a head-scratcher, though.