I don’t think this is just FUD. Many people on this site actually want a thicker iPhone with a replaceable battery. But you are correct, right to repair does not have to mean easy to repair.
Right to repair has nothing to do with making devices thick or thin or waterproof or not waterproof. It's about manufacturers making schematics and spare parts available to consumers and third party repair shops, not voiding warranties when said third party repairs are performed and not arbitrarily DRMing parts so that they cannot be replaced.
It is normal that many people would sacrifice 1-5 mm of thikness for more battery and the ability to replace the battery... but this is not about preventing people to repair their phones, just that people hate to charge their phone daily and always keeping on eye on the battery.
