It is a false premise. Below it two example of two words in merriam-webster with 3 consecutive letters
[https://www.merriam-webster.com/dictionary/hmmm](https://www.merriam-webster.com/dictionary/hmmm)
[https://www.merriam-webster.com/dictionary/riot%20grrrl](https://www.merriam-webster.com/dictionary/riot%20grrrl)
There are more like BRRR, shhh, mmm that are valid in Scrabble. They was not in merriam-webster
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