with my team we built Voiden for some of these reasons, initially for our own internal use (building many APIs for our SaaS marketplace). Most of the folks in the team have been postman power users before so we do remember the time when this was indeed something new.

Problem now is that most of the alternatives out there (including the ones you mentioned) do offer some great things but essentially they feel variations of the same concepts - so I see them as "Enshittification on the way". Reason we built voiden is that we wanted something that challenges these ideas. You can try it out and let me know if it resonates: https://github.com/VoidenHQ/voiden.

apologies for the slight promo - but based on your comment I thought it might be relevant.