The phrase "are merely designed" is correct and usable in written English.
It can be used to indicate that something has been created or intended for a specific purpose, often implying simplicity or lack of complexity.
Example: "These tools are merely designed to assist users in completing basic tasks efficiently."
Alternatives: "are simply intended" or "are only meant".
Since our growth conditions are merely designed to test the effects of the metabolic modifications at lab scale, several improvements, such as the use of more optimal culture conditions and A. niger genetic backgrounds, could be done in order to increase the itaconic acid production to the desired industrial levels.
It does mean to stop adopting policies that have nothing whatsoever to do with American interests, values or national consensus but are merely designed to please some domestic constituency.
For example, some redundant probe sets are merely designed to measure opposite strands of the same gene when the array design process was unable to determine the genomic strand of a transcribed sequence.
Do you honestly think that your super-cool headphones are merely designed as a tool used to listen to your favourite techno music?
Additionally, we are merely designing an add-on mechanism for the existing alarm clock design, which would certainly fit within fair use guidelines.
But he infuriated reformists, saying his suggestions were merely designed to "generate further debate" and were not a "final blueprint".
Rouhani said western sanctions had nothing to do with the nuclear issue and were merely designed to target ordinary lives.
The university said the measures were merely designed "to ensure the safety and security of staff, students, visitors and property" during the G8 weekend.
The new definition has nothing to do with opposing antisemitism, it is merely designed to silence public debate on Israel's crimes against the Palestinians.
On Thursday, the company said that Mr. O'Brien's requests to sell its flagship paper were merely "designed to destabilize the company".
But he was visibly irritated when asked whether his diplomatic blitz was merely designed to buy time with his Western interlocutors.
