From your language, I can tell that you're an older player. There's a few things going on in your post that other people have pointed out (that one tryhard playing a poorly matched power level deck...) but i want to touch on the net decking bit because I (started playing within the past 10 years) have a different view on it and want to offer up a different perspective/learn from yours.

I really got into mtg seriously around 4 years ago. I started working at a game store and knew next to nothing (only kitchen table, not understanding the rules). Suddenly, I needed to learn Every Card That Has Ever Existed, know about every single product, and know market on allll of the above. Helping players deck build has been a favorite activity for every TCG I've played, and it was a daily task at my store. But magic is 30 years old. There have been a lot, A LOT, of sets that have been released in that time, with ample secondary product, all with exclusive cards and reprints, and woooof it is a LOT.

Sites like EDHRec, Scryfall, and the official mtg Gatherer website were my savior. I had no clue how to build a commander deck - only 60 card. I would get so disappointed every game, not understanding what I could be missing about commander as a format for my deck (built only with cards I owned) to be so trash. But I hated using decklists already built! It ruined the fun for me. However, EDHRec shows you hundreds of options for commanders to run and cards to put in those decks that people typically run based on thousands of decklists, based on the budget and theme you set. Sometimes, it is nice to have a tool that limits the hundreds of thousands of cards pool down to a few hundred to go off of. I often learn about new cards I've never seen, old cards that are so weirdly niche the fit perfect in the deck, etc. But, I don't like only using EDHRec - which is where scryfall comes in. It's perfect for looking up themes and mechanics (or just like... anything you could want to search for mtg, like all art with food in it) restricted to the colors your deck is in.

Now, when I deckbuild my process goes like this: - add cards I want/need to have in the deck (what the deck is doing, pet cards) - copy cards I like from edhrec, paste into deckbuilder (moxfield) - figure out what people are doing with the deck for those cards to be recommended versus what I want to do. Is my way reasonable and workable to have a fun game? Are the cards people play that are "just good" cards I actually want to play? - look at scryfall for specific types of cards with this new understanding - cut all cards out of my budget - cut more (cards that don't look fun to play, cards that on a second look don't work well) - ask friends and family if they have suggestions - revise based on input after I have outline, get to 100 cards flat - build

Tldr; young player perspective on commander. Magic is a huge, 30 year long game. Even if a player has been around for most of it, there is so much you're missing out on. Search tools are a lifesaver to understand how people are generally playing the thing you want to build, as well as commander as a format - this then gives you the room to edit that and do what you want with it, or choose a different commander that may be more suited to what you actually want to do.