It’s a good question, as long as the why is not a burden to be met.
First it’s a useful skill set that helps troubleshoot problems in code and apps that run on networks by knowing how such things work.
Second, try to think of it as a private cloud instead of a network. Because it uses a lot of the same types of software cloud provider do. Proxmox is one example that is a self hosted vps provider that is tremendous. So, it’s a private hybrid cloud that can push from your cloud to the other voids (or back). Build using a private hybrid cloud and you can push to,or between manu clouds
Wifi is for convenience, wired is for reliability. When wifi gets jammed, spotty, interfered with which can happen more often than imagined, especially during break ins, wired wins. Transferring files? Wired wins. 4K streaming ther doesn’t cut out when multiple devices are doing it at once? Wired wins.
Self-hosting is much easier than it was 5,10,15 years ago. Tools like proxmox loaded with yunohost running on a 1L usff/mini/tiny pc with 64 gb of ram and mirrored ssds ther maybe mirror to another i de oval box can sip power but power production grade apps for you personally. If you buy big beefy servers it will cost a bit more electricity.
Still, hosting locally can quickly pile up the savings on saas not spent.
Imagine being able to keep up all your test projects you might spin up a paid VPS for and run for way too long. They might not be production grade, but there is something valuable about having them around.
Data backups - the cloud is just someone else’s computer sold as convenient but not secure. Having your own local copy when the internet goes down means not as much of your life or work goes down. Remember it’s not a backup if there is only one copy of it.
Backing up your computers in the cloud are only so helpful when they are down, a lot of time to download them. Local backups win again.
Multiple connections can matter for people who wfh and can’t be down, or have spotty internet that is up.
If you like smart home tech, it’s a ticking clock until the cloud based supports for it that are usually free dissapear leaving perfectly good gear unusable. Instead you can run a local instance of home assistant, etc.
I used to host morethan I wanted ina. Data centre much like this rack. I was hesitant to come back to self hosting or homelabs but j have realized a home server that runs like an appliance (in between that wiring) capturing the sum of all my data and worn as services come and was pretty much unavoidable. Luckily it’s getting easier and easier to do.
Hope that helps.