Four reasons why boarding earlier is a great reason to have a more comfortable trip
No matter whether you travel first class or economy, being able to board before other passengers offers the assurance [...]

No matter if you are traveling first class or economy, being able to board before other passengers offers the assurance of a more comfortable trip. Priority boarding is a key benefit in loyalty programs, and low-cost airlines sell this service along with all other paid options.
#1 Less time in the queue
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The first reason is perhaps the most underestimated, which is to Stay less time stopped in the queue. It doesn't matter if you fly Ryanair or Lufthansa, if you can board earlier you will spend less time waiting at the gate, on the stairs, and in the aisle. And getting to your seat earlier means being able to sit down without having to let anyone get up.
#2 Certain space in the hatboxes.
The second reason is the most important one if you are flying economy or on a low-cost airline. Getting on the plane first means Having the assurance that you can sit down while keeping your luggage close by by hand and not having to hunt for a hole in the hatboxes, maybe rows away, with the I also run the risk of being stolen.
#3 Baggage does not end up in the hold
When the flight is full and many passengers board with trolleys at the limit, those who board last run the risk of having their carry-on luggage end up in the cargo hold (free of charge), but this very often means that when you get off the plane you will have to wait for your luggage to be returned instead of being able to leave the airport quickly.
#4 Avoid ending up among passengers "in the way"
Certainly at the moment the planes are far from overbooked, but it may happen that the captain for safety reasons (adverse weather conditions, more cargo in the hold) makes this decision. And to be sacrificed are often the last passengers to board.
Things also change if you travel business or first class, here the advantages are not about having more space in the overhead compartments, but it generally means having more time to get comfortable, enjoy a welcome cocktail, get acquainted with the dedicated staff in the cabin, and sometimes even have a word with the captain.
In conclusion

The first-class cabin on board Lufthansa's 747/8
I like to board first, being able to poke around inside the plane when the other travelers are not yet there allows me to take pictures, walk around the other cabins, and sometimes even pop into the bathroom.