Does having a heart have any reflection on the ability to love and feel? Or is it just a weakness?
Depends on which season, IMO.
Will Scarlet of WL lost his heart and his feelings went with it. He was unable to form romantic attachments, though he was able to bond with others, like Alice.
Graham on ONCE proper in S1 said he couldn’t feel anything and felt as though he was unable to love or have any sort of emotion beyond the basics.
Regina took out her heart in S3B (312) and her pain was instantly less. However, when she was in SB later that same season and did not have her heart she was able to express complicated love/romantic feelings toward Robin Hood.
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"He was a lot of things to me" "The only conclusion was love"