Supervisor not privileged? Sounds to me like it does not have root privilege? But I am no expert on that.
I am running a genuine Intel NUC i3 with 8GB Ram and 2 x 256GB SSD. I find that this works quite well.
Current Stats on resources.
I have a few serial devices
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ZWave USB stick
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RFlink for 300MHz devices ( This is an Arduino with a RF receiver that a guy in the Netherlands made. I use it for monitoring Fridges and Freezers) see https://www.nodo-shop.nl/nl/search?controller=search&orderby=position&orderway=desc&search_query=rflink
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I monitor my swimming pool water temperature using a RPi Zero using this https://www.fezfox.com/raspberry-pi-pool-temperature-monitor/
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I also monitor my solar system and electricity consumption
I also monitor 6 surveillance cameras using ONVIF. This is only a quick view as the main system is on my Synology NAS.
Of course there is the hookup with my Ecowitt HP2551 display
So as you say the HA is quite a useful tool in my house too.
I think you will be very pleased with your NUC!