I'm tired of new players being added to our party

Hi! As the title says, today's session will be the 4th session in a row where a new player has joined our campaign. We started with 4 PCs, as of today we are up to 8 PCs. We just hit level 3 last campaign and our DM is letting the new players start at the level that we are all at. The DM is my husband btw so it's hard to argue with him on it. I'm upset because it seems unfair, especially because the player being added today did not want to join in session 1, but now sees how much fun everyone is having and wants to.

It's hard to RP and it makes combat even longer - my husband DM says that he's the DM so he can decide to add people, but it's really annoying.

I don't wanna gatekeep fun or whatever, and I'm sure it'll be a good time, but I'm tired of spending half an hour each session introducing new PCs and combat just getting longer and longer.

I just wanted to know what everyone else's opinions are.

EDIT FOR INFO & RESOLUTION: - We do this all over discord, as our party is scattered around the Midwest - everyone is all my husbands friends and I often feel on the outside of the group (which leads to my PC not being interacted with)

The resolution: I got very upset and left the game halfway through last night, because I was not being involved in the goings on whatsoever - and I understand it's a game I have to say "oh and PC follows along!" But it can get quite disheartening to not be involved, and it's especially hard to interject with so many other people and personalities.

My husband noticed I had dropped and he paused the session to talk it out. He admitted to not considering my feelings when it came to 8 players, and he said "I'm the DM" because he was only thinking how he'd be able to handle it, and not how I would be able to handle it. He took full responsibility for not steering the group back on track at the market (2 PCs bought fish for 45 minutes, and while others thought it was funny it was my last straw to be done that night) and he told me that he only wanted to DM this campaign for me, since I was missing playing and that if I'm not enjoying it he doesn't even want to DM, and said it's because everything he does is for me.

We had basically a session zero after the pause at session 7 since there were so many new players and I spoke about my feelings of feeling left out and while they didn't understand at first (since they are all friends and know how to interject and talk over each other), that they recognize my feelings as valid and will always make an effort to include players they feel that have been quiet for a while. I also had wanted to establish are they playing dnd because they like dnd or because they like hanging out with their friends, and while I don't think people need to take it SO seriously, I'd like it to not feel like a comedy improv show every session.

Tldr; husband apologized and owned up to his actions, the party talked it all out, I will be continuing to play with this group because I genuinely enjoy playing with them now that we're all on the same page!