When you bet on a match you are watching/ following, you are likely enjoying the match and every situation in the match. In entertainment aspect, it is good for you to have fun and refresh your mind.
But it is not only good, if you are a type of person who can be affected by emotion, you will make more extra bet during the match. By emotionally bet more, you are taking more risk with more emotional bets. It will potentially lead you to more inaccurate bet decisions.
Well you should not bet if you can't watch the game you are betting on since you will just get easily affected once the result will show not in favor to you. But if you are into fun factor and just add up some bet just to make all things exciting while watching then I guess this is really a good option since it could spice up the speculating experience since there's a bet at risk. Also once you and your friends are their watching together this negative feeling will be eliminated and for sure the fun factor will be there then they might forget about discouraging feeling on the losses they get. If they really want to win and want to avoid those inaccurate betting decision then they must research first before placing so that they could see on which of them have better chance to win.
When we watch football games, those opportunities that other teams have to score a goal and they are constant opportunities, they are not a good indicator that the team that is putting a lot of pressure on the other team will win, you can test it yourself by placing a bet during the game and you will see that you will hardly be able to find a decent odds to place a bet, you will hardly be able to find a decent market, because during the live game you may think that as one of the teams is putting a lot of pressure on the other team's defense then this means that the other team will be able to score a lot of goals and bookmakers will place low odds on over goals markets
and if you want to place a bet on the under goal market then you would be taking a big risk because more goals could come in, so it would not be a good choice to bet on the goals market. in the corners market it will also be more complicated to bet during the game, also while the person is watching the game it is difficult to pay attention to the game and analyze the game at the same time, which is why in my opinion it will be better to place a bet before the game but after announcing the squad that will play, because one of the biggest mistakes people make is placing a bet without first checking and confirming which squad will play, the person looks at the greatness of the team's name and then decides to place a bet
For example, a case in which inter plays against lecce, the person looks at inter, knows that inter is a big team while lecce is a small team, so the person will soon bet on inter to win because they are starting from the beginning that inter is a big team and lecce is a small one, but on the day of the game inter could field lower quality players and thus lecce win the game, this is one of the biggest disadvantages of people betting without first seeing the squad initial match, while if it were a live game in which the person was watching, they would know that Inter would be playing with a lower squad, but the odds would be low if Lecce won