ProtonMail has pretty much stagnated and flat out refuses to cooperate with the community to implement new features of the OpenPGP email standards. Their Reddit guy is also pretty terrible, he pretty much insulted me in a comment after I criticized them.
ProtonMail would be happy to implement more of the OpenPGP encryption standard. Specifically, it would be great if someone would contribute ECC support to the opensource OpenPGPjs project that ProtonMail currently maintains. There are just not cycles to do it internally, right now. ProtonMail is far from idle. A number of new features and offerings are being worked on. For example, take the bridge application (currently in beta testing) that will allow integration with IMAP based applications like Microsoft Outlook.
If there's something that is a high priority for you personally to see (such as OpenPGP ECC algorithm support), I would ask that you take the time to submit it to the ProtonMail UserVoice page [ https://protonmail.uservoice.com/forums/284483-feedback ]. That page is monitored and the feedback received through UserVoice is considered and strongly influential. UserVoice has a great end user application and clarification effect that is difficult to experience through interacting with users through e-mail or traditional forum comments.
I don't believe I've seen the Reddit exchange that you are referring to (I don't personally visit that site very often). If someone using an official company account was rude to you, I sincerely apologize.
