Has the quality of airline flights declined?

I just got back from a trip. It was the first time in a while that I had flown in an airplane, and I am wondering if what I experienced is the norm.

My flight was delayed by a few hours due to “maintenance.” There were no remaining connecting flights for the same day, so I had to schedule a flight for the next day. On the next day, a flight at one of the adjacent air terminals was delayed for maintenance, so I am suspecting this may not be so uncommon.

They announced that there was not enough room in the overhead bins for carry-on luggage. They asked people to voluntarily use the baggage check-in process. Otherwise luggage would be randomly selected to be placed in check-in. This is apparently routine, because they did this for each of my flights back and forth.

On one flight, some seat assignments were reassigned. They told us to check for gate changes on the connecting flight, and in one case the gate had in fact been changed.

The room between seats is pretty much non-existent. There is no elbow room. The seat recline button did not work, which is a good thing, since there was no room for it.

On one flight, there was a really loud buzz on the intercom, making it hard to hear what was being said. No apologies were given.

My flights and connecting flights were scheduled really close. The outbound flight was delayed by 15 minutes. When I reached the gate for the connecting flight, boarding had already started.

The biggest annoyance was having to come back the next day, but the other features combined to make flying a much less pleasant experience than it used to be.