It is true that your average user will be just content with the way Pi-hole works, but there are us who like to see the innards of it in action. And well, yes, Unbound is not maintained by you guys so you wouldn't have to do anything else BUT add an option to view the Unbound log from within the Pi-hole interface, that's all.
It could be as easy as just un-commenting a line:
## Out of documentation
#LOGFILE=/run/log/pihole-ftl/pihole-FTL.log
#PIDFILE=/run/pihole-ftl/pihole-FTL.pid
#PORTFILE=/run/pihole-ftl/pihole-FTL.port
#SOCKETFILE=/run/pihole-ftl/FTL.sock
#UNBOUNDLOG=/place/for/log
pihole-FTL.log (just shows messages of what the program is doing, boring stuff)
Resizing "FTL-dns-cache" from 32768 to (2304 * 16) == 36864 (/dev/shm: 1.6MB used, 2.0GB total, FTL uses 1.6MB)
[2021-05-13 16:34:32.889 1644M] Resizing "FTL-domains" from 24576 to (1792 * 16) == 28672 (/dev/shm: 1.6MB used, 2.0GB total, FTL uses 1.6MB)
[2021-05-13 16:35:37.952 1644M] Resizing "FTL-dns-cache" from 36864 to (2560 * 16) == 40960 (/dev/shm: 1.6MB used, 2.0GB total, FTL uses 1.6MB)
[2021-05-13 16:35:40.602 1644M] Resizing "FTL-strings" from 81920 to (122880 * 1) == 122880 (/dev/shm: 1.6MB used, 2.0GB total, FTL uses 1.6MB)
[2021-05-13 18:05:02.654 1644M] Resizing "FTL-dns-cache" from 40960 to (2816 * 16) == 45056 (/dev/shm: 1.6MB used, 2.0GB total, FTL uses 1.6MB)
pihole.log is more interesting (shows domains blocked per user lists but just forwards the queries to Unbound without knowing what happened next)
May 13 19:00:39 dnsmasq[1644]: reply www.apple.com is <CNAME>
May 13 19:00:39 dnsmasq[1644]: reply www.apple.com.edgekey.net is <CNAME>
May 13 19:00:39 dnsmasq[1644]: reply www.apple.com.edgekey.net.globalredir.akadns.net is <CNAME>
Unbound lets you see what traffic goes in and out, if it is encrypted (#853) as well as if the server was unresponsive even at that (useful for debugging, etc)
[1620950439] unbound[1615:0] info: query response was ANSWER
[1620950601] unbound[1615:0] info: 127.0.0.1 time-ios.apple.com. A IN
[1620950601] unbound[1615:0] info: resolving time-ios.apple.com. A IN
[1620950601] unbound[1615:0] info: response for time-ios.apple.com. A IN
[1620950601] unbound[1615:0] info: reply from <.> 1.1.1.3#853
So I digress with your opinion. It is very helpful and insightful to include such an option in Pi-hole for completeness sake. Again, please consider adding it to the program, it's a very easy thing to implement.