Pi is 100% not suitable for 100% duty work. It’s just a toy.
SD cards are quite frankly horrible boot media as well.
That's an additional 145kg of CO₂ per year (2018 US average).
For that you gain:
Decent thermal design., A decent quality enclosure, A power supply (thinkpad brick), Two displayport holes, An SATA interface (M.2 form) for an SSD, Built in Wifi, A RAM slot you can chuck 16Gb in, 2 more USB ports.
There's no competition. I paid 79 GBP each for mine (I own 3). Pi is 57 GBP bare board.
Pictures. Mac mini for scale: https://imgur.com/a/jXjLusb
And on CO2, perhaps you should just do without it if it's a problem.
I bought one to run Windows on my Retina MacBook Pro. I only need Windows for gaming when visiting friends, and it works flawlessly for that purpose.
also Pi4 now supports boot from USB: https://www.tomshardware.com/how-to/boot-raspberry-pi-4-usb
Check speeds when you get it to see what works for you best.
