Maybe if they are a new seller. If a buyer is selecting someone with a significant track record, then contacting them isn’t needed. It depends on the category AND if the seller is newer.
Also, buyer requests are not usually the best method for picking sellers.
Many established sellers don’t monitor those daily, but many newer sellers do. A buyer may get 10-30 responses, but those responses vary widely in terms of experience and track record.
Buyers would do well looking at the leaders in each category, and the newer sellers are also easy with the filters available for searching.
Get a sense for what is the best quality work on Fiverr, and the price ranges for available services.
If you plan a larger project, buy a $5 sample from the experienced sellers. Experienced sellers rarely do free samples, but for a larger project a $10 or $20 budget, spread over a few sellers is a great way to find the right fit.
Select a couple established sellers, and try out someone new IF you like their samples.
I’m not against buyer requests, but it’s not the place where most mid-level or higher sellers monitor on a regular basis. Many of us rarely visit anymore, because the quality of the requests varies so much.