Some people do use toilet lid covers still although toilet lids covers like the carpet like toilet lid covers are less popular now than they were years ago.
The decorative cloth like toilet lid covers are not in use as much as they were before but some people prefer to use them.
Some people still also use the disposable and flushable toilet seat covers in public restrooms but they are not used as much as they were used before either.
The reason why you should put the toilet lid down is to prevent the spread of germs when you flush the toilet.
When you flush the toilet germs even though you cannot directly see them can spread through the air as tiny droplets and spread germs around the bathroom, especially feces.
Although I never personally put my toilet lid down at home but some people do.
The toilet seat should also be put back down if you have other people in the house who need to sit on the toilet to prevent them from accidentally falling in the toilet.
Although public toilets don't usually have toilet lids and only a toilet seat and so germs can still spread in public bathrooms but it's not really that much of a worry.
You're unlikely to get sick directly from your bathroom even if you don't close the toilet lid before flushing as long as you keep your bathroom clean and disinfect the bathroom often.
You're more likely to pick up germs and get sick from someone else that has the flu or coming into contact with things that have the flu virus or other viruses.
The toilet lids are considered an important part of the toilet to reduce the spread of bacteria and are designed to keep the bathroom cleaner when you flush.
The toilet lid according to some people on the spread of germs should also be kept closed when not in use to maintain hygiene, control odors and prevent spread of germs.