I was just having this discussion yesterday. I bought a new FS rig and am now converting my hard tail into a pump track/ jumper. I’m leaning 1x on it and 2x on my XC. My first build so I’m researching. You guys have all made great points. I cant speak to the drivetrain question but as far as tires I am converting to tubeless. I want to do it to run lower pressure as I run many “soft” trails and loose rocky trails around here. I also don’t want to have to worry about tube issues. I will keep a spare tube and pump with me though just in case.