Noob - VZW One - ROM questions

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http://forum.xda-developers.com – Don't know much about ROM modifications etc... I have done it before since I am good at directions... I am just a little confused... All the reports say bootloader is locked and no hack etc. Thought bootloader had to have unlock/hack to apply roms... Why are there a number of ROMs in the dev section... just for the people that were unable to unlock on day 1? Mainly looking for maybe a ROM with stock android or tweaks or something. Would like to upgrade android when VZW basically drops OS support in 6mo.. (HowTos)