Mobile home faucets come in at least three qualities.
This can range from the very cheapest, chrome plated plastic, to brass stemmed units like you would find in a site built home. Unfortunately, the price pressure on manufacturers, especially on low end units, means the cheapest ones are the ones that usually come with a new home.
Fortunately faucets are also fairly simple and inexpensive to replace. Some are the same size as those used in site built homes. Others, especially for bathtubs, are very specific to mobile homes. Make sure you are buying the exact replacement or installation may be more “fun” than you expected.
Faucets are used so much and water leaks are such a danger to a mobile home that I don’t think you ever want to replace faucets with the cheapest all plastic units you can buy. If you have an expensive home with good faucets, it will pay you to replace washers, O rings etc. In any other cases, I would suggest planning to replace faucets whenever they start to drip.
In particular, if you have to pay someone to replace faucets, make sure they install quality replacements. Most of the cost is for labor, and it doesn’t take any more time and effort to install quality faucets that will last.
In a new home or a home where the water lines have been worked on you may find the water flow slow from either the hot or the cold side. The probably means something got into the line and is partially blocking it. On a new house that is probably covered by the warranty, but rather than wait for someone to come out to fix it, you may want to go ahead and take the line apart and remove the obstruction yourself.