Some elaboration would help. First, it's clear that several of these things are OS / software issues. Debian has issues with the screen and wifi, whereas other

Some elaboration would help. First, it's clear that several of these things are OS / software issues. Debian has issues with the screen and wifi, whereas other distros have better wifi handling on the same hardware? That's the OS. Firefox is slow with Slack? Firefox is slow with Slack on the fastest hardware you can buy, so why state the obvious? Firefox apparently doesn't have hardware video decoding enabled, which is, again, a software issue. Disk operations seem sluggish? Why not say whether you're using a cheap eMMC or possibly even an SD card? Unless you're selling your Pinebook Pro on eBay as-is, you've left out too much information.