I would scrape them off without using much force. Otherwise they can come loose on a worst time possible and maybe short circuit some pins when the board is powered. Probably will never happen if the raspberry is statically mounted sonewhere, but you never know
I’m not a native speaker, but the following come in mind: crew, team, ring, syndicate, tandem, gang, allied, collaborate,
Those leftover solder “blobs” are quite usual on raspberry. Better than pure chinesium quality though.
The small marks are just on the PCB’s clearcoat and will not matter electronically.
Just test it out. You can boot from USB without a sd card with PI4 ;)
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Windows also has multiple desktop “spaces”, but the touch side is way smoother on the mac.
P.S If you are going to run some servers/services off the raspberry do not use regular usb sticks or sd cards. Get a USB ssd or USB to sata or M2 adapter. Some write intensive applications burn through quality sd cards/usb sticks within a year