King vs. Major Piece. Why promote?

Why do players with a Queen or a Rook vs. a lone King still push their pawn to get at least 2 majors before they will mate? Do they really not know how to shepherd with the Queen? The 2 primary single Rook methods?

I was playing someone and we were chatting, having fun. He is going to win so when I saw he was promoting instead of just finishing me, II started giving him a hard time. Playfully. "C'mon just finish me with Queen, you don't need to ladder mate me." He got kinda upset it seemed. He insisted on ladder mate with 2 Qs or I should just resign. He was such a nice guy for an hour.

I played it out. I rarely resign anyway, so when someone tells me to, I'm definitely not. I got the feeling he was embarrassed he didn't know it. And it is embarrassing, and lazy for that matter. Learn those single and double piece patterns, excluding N&B. 

I thought let me see what else this person might not know, so I asked which solo Rook method he preferred: The King Opp./ step back method or the shrink the box method (no checks til mate)? Maybe he wasn't familiar with those terms but it's pretty self explanatory. Are there any other single rook techniques? But he didn't respond. Nor did he want any more rematches. Rejected my friend request too .

So the question is what motivates people to either promote far more material than needed to win? Is it just to be 110% they're going to win? May be some of those are afraid to stalemate, so they promote another major?  The ironic thing is, it's easier to stalemate with 2 Queens IME.

I like to beat folks with as little material as possible. I want to keep my technique sharp but I also want to beat my chest and say to my opponent: "I'm intelligent HUMAN, not scared of stinkmate or a 3 repetition draw." It's almost a minimalist philosophy that I try to abide by, so this could be the norm before Master level?

Let me know if you have noticed this over promotion of materials not needed and why you think players do this? Are you guilty of overpromoting material so your Queens cover the whole board?

Tbh, I think it is just makes them feel better, if you know what I mean. Like, they have the full capability of destroying the king. But it really does depend on the elo that the player is

Hmm. @Bobbygotfischered I didn't think about them feeling disrespected bc I feel like I'm being nice by letting them play it out. Finish the game. Ya know. I'm talking about like the last 5 to 10 moves and they're obvious moves and the pos. is dead dead dead for me. If I blunder a full piece against someone a few hundred pts above me, I'll resign but it's more bc I don't wanna play that miserable pos. rather than I don't think my opponent is capable of blundering. 

It's the 1,000 to 1100 range. I've never claimed to be good at this game but those were some of the 1st things I learned. 

I guess it depends on the player & the ELO to an extent. I mean my rating is what it is, but like I've already said if I have a Rook and 3 pawns V. King, as long as they are not in my way, I don't promote. Some would maybe consider that silly but it's definitely subjective.

I only resign OTB bc I actually know those players. I'll resign online if it get's to be plus over 5. I'll play on at +4 or 5. 

some players may not be sure how to mate u only with a king and a rook, or they may not know the best moves for...but perhaps they just wanna have fun by playing dominance, i mean just imagine fighting against a much smaller, slower, and weaker opponent

Two Queens is a very fast mate, also trying to irritate your opponent is the best way to ensure that they won't want to play you again.

Same motivation that has Putin and his buddies pushing into Ukaine. More is never enough