Whether or not it is a disadvantage depends on what you are trying to do with the table.
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You can relate the data present in multiple tables by using the concept of Foreign Keys. for example if we have an employee database that contains various details of an employee scattered in multiple tables, one column in each table can be used to logically group the data in all these tables. For example, the employee number column in each of these tables can be used to relate the data present in these tables.
The transum times tables website is amazing. You can learn so much from it.
Tables are the basic building blocks of a relational database.
They just are
Just working with fractions if the coefficient of x is not an even number, however I would not call it a disadvantage because fractions are beautiful numbers.