With Football and Basketball, the rules determine that the game is `x` minutes long, but because people are adapting games like Rocket League which were built for 'short' 5 minute matches and then a player is on to the next round. Where you see most of the time, like with League of Legends' LCS is that they can string multiple matches right after another on the same day. There's plenty of pregame and postgame talk and fluff, but you get that with other sports as well.
A great example of Football having the pre game coverage is the Texas GameDay team, which will start broadcasts at 6:30 PM and end at 8:45 with the beginning of game coverage.
Disclaimer: I play Rocket League semi-professionally, and was previously a technical director for a Football team's live cast (radio, TV, livestream).
I'm quite sure this is very intentional with Rocket League broadcasts. There's even a "director cam" that Psyonix built for this purpose, and it is still used often. It's just that it's not as exciting or impressive when you're not seeing it from the player's view for whatever reason. Everything looks slower and you miss all the nuances of the pros' mechanics.
Also most esports telecasts have too much fluff and too little gameplay, hours of pregame chats and pettifloggery for very short actual gameplay, they should take a hint from football(Soccer for Americans), esp EPL broadcasts, very less fluff.
I think the content would be richer if one could spectate the tournaments in-engine rather than watch them as video streams, atleast then viewers can take full potential of such telecasts, see things from any angle / perspective desired.