"as a tendency" is a grammatically correct phrase and can be used in written English.
It is typically used to explain a common or usual behavior, action, or inclination of someone or something. Here is an example: "As a tendency, humans have a desire for connection and belonging." This sentence is stating that it is common for humans to have a natural inclination towards forming relationships and being a part of a community.
Usually it attaches to some less endearing quality, such as a tendency to preach and moralize.
The disorder may appear in childhood or adolescence as a tendency toward solitariness.
He would seem to have retained some of his old weaknesses as a candidate, such as a tendency to go off message.
But he had Trumpian qualities, such as a tendency to withhold payment from venders like contractors, cleaners, and architects, forcing them to accept a fraction of their fee.
Experiences like paranoia are also linked with a number of psychological traits, such as a tendency to worry, feel depressed, sleep poorly, or jump to conclusions.
He criticized European and American diplomatic hesitancy as "a tendency to posture, to make statements as opposed to actual policy-making".
In her letter, Aung San Suu Kyi hit out at education standards, citing underfunding as well as a tendency towards rote learning rather than critical analysis.
For liberals, this sometimes plays out as a tendency to see resistance to all liberal policy as an inevitably losing battle against the inexorable tide of history.
For Gavriel Rosenfeld, this wave of trivialisation goes together with new trends in academic history such as a tendency to regard the Nazi extermination of the Jews as just one genocide among many.
"What that survey revealed was a widespread sense of unease about Mr Osborne's inexperience and what is seen as a tendency to "make up policy on the hoof", in the words of one senior banker".
Some demonstrators held signs calling for the dismissal of city officials, and others criticized what they saw as a tendency by construction companies and the city to cut corners rather than commit to an investment in equipment and enforcement.
