Admittedly my use case is not the most common. For a number of what I think are well founded reasons I don't use the "smart TV" OSes built into any televisions I own, none of my TVs have the wifi password or access to the Internet. The HTPC screen is just a screen, something else that's smarter is driving it.
I also don't have any need for realtime transcoding as my home internet upstream speed is sufficient that I can watch 'full resolution' stuff remotely from my laptop or phone via VPN back to home office, and smbfs or sshfs access to the same file shares, without needing to use any CPU or GPU resources to process the video in realtime in between where it's stored any my client playback device.
The transcoding isn't just about bandwidth, it's about compatibility. I store most media in H.265 because that's the most space efficient, and most things can play it, but a decent number of devices still need H.264. I also have older content with DTS soundtracks, which isn't supported by a bunch of new devices.
Plex/Emby/Jellyfin will handle that compatibility by converting on the fly.
Plus, when using a Fire Stick, or Google TV Streamer, or old Chromecast it just isn't easy/possible to browse a SMB share.
After being too used to the streaming app experience, I wanted the same thing for my own library. You don't need to use the transcoding feature but the Netflix experience is a nice upgrade. The Jellyfin server doesn't need much for resources either (if you aren't transcoding), people run it on raspberry pis with external harddrives attached. Once nice thing is that I often forget about the stuff I've downloaded, Jellyfin has a "recently added" section and will also remember where I've left off with a "continue watching" section and also a "next up" section showing the next episode in series I'm watching. Since I have sonarr subscribed to currently airing TV shows, the latest episode will appear there after its been downloaded.
The annoying thing is that Jellyfin is particular about how your TV shows are organized. If you just dump whole seasons into one directory, that's fine but if you have individual episodes, they need to be organized by Title/Season #/Episode.mkv. The good thing about Sonarr is that it will make a second library directory for you comprised of hardlinks organized in the right structure. Plex is less picky, it seems to recognize files no matter how messy your downloads folder is but Plex has infected their client with ads and freemium garbage of late. Obviously if you use usenet, this isn't a huge problem, you can do whatever you want with your files once downloaded.
> I also don't have any need for realtime transcoding as my home internet upstream speed is sufficient that I can watch 'full resolution' stuff remotely from my laptop or phone via VPN back to home office, and smbfs or sshfs access to the same file shares, without needing to use any CPU or GPU resources to process the video in realtime in between where it's stored any my client playback device.
And if your remote internet connection is insufficient? Especially if you have all content in high bit rate HDR stuff… that can be problematic in some parts of the world.
If I had your setup, I would still prefer the client experience of either Infuse, Jellyfin, or Plex, but I don't think I'd value it enough to pay. The first time I used plex, I was impressed by the fact that I didn't really need to do any of what you've described with your collection (for the most part). I just had a huge dump of torrents and other randomly sourced video files, in wildly varying formats, that were named just barely well-enough for Plex to turn that into a very nicely browsable home media experience with no extra work, that I could then stream to any device with a client. Not that I'd be dismissive of manually organizing a collection, it's just not a compelling hobby to me, so a drop in media viewing experience with an amazing frontend that handled all of the meta stuff was spectacular.
In contrast to your HTPC setup, I've actually never even considered owning my own TV, it was just a streamlined way for me to access my collection on other non-TV devices, including the mac I didn't want to keep files on.
If you don't care for any of the modcons of a media streaming system similar to Netflix, etc. then more power to you, stick with a SMB share. It's undeniably less that can go wrong and god knows these systems can become a janitorial hell sometimes.
However I hope you can see that there is a plethora of benefits that others may enjoy from it. Otherwise, this kinda feels like the classic HN Dropbox critique.