"Some clients explicitly ask for wordpress/drupal"
Important though to find out why they are asking for something in particular as the first step. Could be because a) someone else is bidding using that (giving you an opportunity to suggest something else) or b) they read about it somewhere and think "that's the right thing to do" or any number of other reasons like c) a trusted person advised them to use that for some reason.
By asking "why" you will be able to use the reasons in your pitch to them for what you can do or even suggest another technology (which of course depends on the reason they give you obviously if they trust their "brother in law" you don't want to go against his advice etc.)
Most common reason for insisting on technology X in my experience is because they have someone in house who knows X and they don't want to be stuck pay $$$/hour every time they need to make a minor tweak or update.
Comments
"Some clients explicitly ask for wordpress/drupal"
Important though to find out why they are asking for something in particular as the first step. Could be because a) someone else is bidding using that (giving you an opportunity to suggest something else) or b) they read about it somewhere and think "that's the right thing to do" or any number of other reasons like c) a trusted person advised them to use that for some reason.
By asking "why" you will be able to use the reasons in your pitch to them for what you can do or even suggest another technology (which of course depends on the reason they give you obviously if they trust their "brother in law" you don't want to go against his advice etc.)
Most common reason for insisting on technology X in my experience is because they have someone in house who knows X and they don't want to be stuck pay $$$/hour every time they need to make a minor tweak or update.