When a mod is made for a certain type of modloader it will not have a download button if you are using a different modloader in your pack, some mods have intercompatibility between modloaders somehow (E.g. "Sinytra Connector", which allows fabric mods to be played on forge (BETA)).
CurseForge already automatically filters the mods deemed 'incompatible' with the users modpack by default, that filter already helps some users making a pack and that's a great feature, but when the user removes it, the user may want to be able to download any mods, even if that means they are not compatible by version or modloader.
Allow users to download any mods for any modloaders and versions, you could lock that feature behind something like 'Advanced User Configurations' -> 'I know what I'm doing'. so that would be an invisible change for those who are used to how it is now.
This would allow users to more efficiently use their time downloading the mods and their dependencies automatically instead of forcing users to go and 'manual download' it all.
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