Collections are not useless and here's why. Vero was made to address the antisocial, and robotic-behavior of the people rampantly liking and spamming on others on Instagram, etc.
Vero encourages slowing down and absorb the content(s) from your connections and the people you're following.

In other words and in the ideal user of Vero, the Collections show content—filterable—from the people you care about.

I've been proactively using Vero, since February 25 and unless I overlooked something—your stream of homepage feed isn't filterable. It's essentially a repository of the content(s) shared from the profiles you're following and connections. I do agree with you that Vero should consider implementing a section for showing the content(s) the user liked. I honestly would like to see a page or section showing my past likes of others' works.

At the moment, I find the Collections useful as-in. Vero's Support is still occupied at the moment, but you can submit a feedback in-app and have your feature request logged.