Can I enter Thailand more than twice a year by air if the land border limit is two?

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yes, there is no official annual limit on air entries to thailand. Max of two by land

As long as you follow a pattern of a tourist visiting other countries, as many people base out of Thailand when they visit countries surrounding Thailand for a week or two. If you are simply exiting Thailand , and coming back a day, or two later, then you are not following a pattern of an actual tourist, and will be stopped, questioned, and many times refused entry until you get the correct visa. Immigration also profiles, and stereotypes, so if you fit into any of their profiling you will be stopped and questioned a lot sooner. Backpackers have the most problems.

Yes you can. In 2018 I entered three times by air and once by land on exemption.

You are correct, but it entirely is up to the immigration officer you are standing in front off. Too many entries they will deny you.

Recent personal experience of a member.

Done it many times. But if your trying to live here flying in and out. Eventually your luck will run out and a IO will pull you aside question you and either let you in with a last time warning or turn you around and send you back

You are correct. The only written rule about visa exempt entries is that you are limited to 2 times per calendar year at a land border.

There is no written rule about number of times if you arrive by air. Do note that you will not be able to stay long term in Thailand using this method, as after a few times you will be pulled out of line at immigration, and asked what you think you are doing. After this you will likely be warned to stop, or possibly denied entry. When will that happen? Impossible to say as it's at the discretion of the immigration officer you are speaking to.