Is that there's still a ton of wave 3/4 builds that I want to try out but I feel they'll be terribly outdated

Of course, playing once a month doesn't help in that regard.

It's not really a negative thing of course, the point is that I wish I could play more

I think that Wave 3/4 will go really well with wave 5. A Gonzati is a great platform to push Decimators.

Don't worry. It will be a whole year until wave 6. You have time.

I don't see anything in Wave 5 that is going to render anything from the previous waves obsolete, but only time will tell.

Jonus flotilla killer!

Unless Snipe proves to be way more powerful than it is on paper i dont see anything that would kill another card.

Not exactly optimistic that Snipe will be a meta changer, just a neat perk.