Synology’s whole business model (arguably QNAP’s too) depends on you wanting more drive bays than 2 and wanting to host apps and similar services. The premium they ask is substantial. You can spec out a beefy Dell PowerEdge with a ton of drive bays for cheap and install TrueNAS, and you’ll likely be much happier.
But the fundamental suggestion I make is to consider a NAS a storage-only product. If you push it to be an app and VM server too, you’re dependent on these relatively closed ecosystems and subject to the whims of the ecosystem owner. Synology choosing to lock out drives is just one example. Their poor encryption support (arbitrary limitations on file filenames or strange full-disk encryption choices) is another. If you dive into any system like Synology long enough, you’ll find warts that ultimately you wouldn’t face if you just used more specialized software than what the NAS world provides.