bttcli export_preset compress

~/Applications/BetterTouchTool.app/Contents/SharedSupport/bin/bttcli export_preset name="Merged - Default - dim - Lid Angle" includeSettings=true compress=false outputPath="~/Documents/btt/bttcli_export_2025-10-24_plain" minimumVersion="5.718"

Should this produce bttpresetzip or only bttpreset?

In my case it is always bttpresetzip

it depends, if the preset contains files it will always be zipped (it‘s standard zip, so you can unzip it and check)