I'm going to have to disagree with you, for reasons of personally being on the staff team and being a player on the network for 3 years.
From what I see from our staff team is full of extremely hardworking people that dedicate not only their time but resources in making the server a safe, comfortable place for all players. Whether is a chat offense or a disallowed modded client, our team works around the clock making sure exceptional results are given to not us, the staff team, but the players. Yes, I completely agree development is a bit slow right now, but I can assure you that they -goodie bags- will be implemented soon enough as well as many other exciting new updates and perks. I know it's a basic thing to say, but you have to be patient.
I agree with you, summer is a time for booming player count but there are many reasons besides the fact that updated are slightly delayed.
Many players, in general, are leaving MineCraft seeking for more interesting recent games such as Fortnite or PUBG. Interest has gone down a lot in the past 5 years, shown
here along with compared statistics once Fortnite was released. I think it would be extremely ignorant of me to completely deny the fact that yeah, updates are delayed, but it's even more ignorant to solely base the decline in player count over delayed updates and such.
It is allowed as long as it isn't meant in an inappropriate or mean/rude manner.