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While I agree with you that additional DNS server is without a question a good thing, on this you need to understand that if you set up two nameservers on your laptop (or whatever) they don't have any preference. So, if you have a pihole as one nameserver and google on another you will occasionally see ads on things and your pihole gets overrided every now and then.
There's multiple ways of solving this, but people often seem to have a misinformed idea that the first item on your dns server list would be preferred and that is very much not the case.
Personally I'm running a pihole for my network on a VM and if that's down for a longer time then I'll just switch DNS servers from DHCP and reboot my access points (as family hardware is 99% on wifi) and the rest of the family has working internet while I'm working to bring rest of the infrastructure back on line, but that's just my scenario, yours will most likely be more or less different.
I did not know that. TIL that I am people!
Do you know if it's always this way? For example, you mentioned this is how it works for DNS on a laptop, but would it behave differently if DNS is configured at the network firewall/router? I tried searching for more info confirming this, but did not find information indicating how accurate this is.
As far as I know it is the default way of handling multiple DNS servers. I'd guess that at least some of the firmware running around treats them as primary/secondary, but based on my (limited) understanding at least majority of linux/bsd based software uses one or the other more or less randomly without any preference. So, it's not always like that, but I'd say it's less comon to treat dns entries with any kind of preference instead of picking one out randomly.
But as there's a ton of various hardware/firmware around this of course isn't conclusive, for your spesific case you need to dig out pretty deep to get the actual answer in your situation.
For Windows it absolutely is in order of listing however. Typical behaviour is no reply after a second against the primary DNS results in it moving down the list.
Redundancy aside, this is more important when you span multiple datacenters and always want lookups going to the completely local or most local DC available.
TIL about the Linux/BSD not having preference though. Good to know.
My preferred way of solving this is to run a PowerDNS cluster with DNSDist and keepalived. You get all the redundancy via a single (V)IP.
Technitium is probably more user friendly for greenhorns, though.. and offers DHCP too. Beats pihole by a mile.