I might be misunderstanding your needs but my home server uses just LVM. When I run out of disk space, I buy a new drive, use `pvcreate` followed by `vgextend` and `lvextend`.
I've been running LVM and Linux software RAID for like 20 years now.
The only limits (for me at least) are:
smallest device in a raid determines size of that array. But that's fine since I then LVM them together anyhow. It does let you mix+match and upgrade though really I always just buy two drives but it helped when starting and I experimented with just LVM without RAID too.
I have to know RAID and LVM instead of trusting some vendor UI. That's a good thing. I can fix stuff in case it were to break.
I found as drives went to Terabytes it was better to have multiple smaller partitions as the raid devices even when on the same physical drive. Faster rebuild in case of a random read error. I use raid1. YMMV
I still have the same LVM partitions / data that I had 20 years ago but also not. All the hardware underneath has changed multiple times, especially drives. I still use HDDs and used to have root on RAID+LVM too but have switched for a single SSD. I reinstalled the OS for that part but the LVM+RAID setup and its data stayed intact. If anything ever happens to the SSD with the OS, I don't care. I'll buy a new one, install an OS and I'm good to go.
