If it were something easy to implement and manage, and figure out all the conditions for (providing the option to mute 100's of local players, detecting who enters and leaves range), I agree, VoIP is extremely valuable to a game like this. I don't think they've made any work to add it into the game and figure out how it would work, so it's months of development time to get it going, and I don't see it being critical to the EA launch. I'd love to see some kind of VOIP implemented eventually, just unsure how well it would work in an MMO environment. There haven't been many other large scale MMO games with VOIP like this. Remember Starbase will be matching players with potentially 100's of nearby other players. All the "what-ifs" are going to be a monsterous hill to tackle.
Edit: I'd like to also clarify; when I'm talking about Rust and DayZ and similar games in terms of winning a fight, I'm trying to point out - it is in only tense situational and often brief moments where you really wish you had VOIP. It is not a "requirement" 99% of the other gameplay, and most players are in a Discord server with friends. VOIP adds a ton of fun to games, I'm not against VOIP, I'm saying the effort to make it happen in Starbase... I don't see it being worth the dev time (at least not yet). I could totally be wrong. As such, it's not "needed" - what is needed for example is for a player to be able to make their ship go forward. That's a "need" to make the game work. VOIP is necessarily a "want" item. For example, I vaguely remember a game where one player would guide another player through a puzzle remotely using VOIP. In that game, it was required to have VOIP. It made the game work.
If all those unique problems for Starbase could be solved in a short time frame and it would work great and all the conditionals were taken care of, I'd definitely want VOIP. I just don't see it being worth the dev time, again, at least not right now.