All points are clear, if you are a skilled sibber, have service manuals and know what to read and how to read it, be my guest.
With respect of fuel filters, must say that screens works ok, will depend entirely where you bought your gasoline, as there are crappy gas stations too that don't change their pumps gas filters very often. On the other hand, according to extent experimentation : if a engine is used all year round, gasoline related components cleaned frequently including removal of particles, dust, etc, won't experiment prob at all.
An engine that is used only in summer time, and not correctly winterized, that is, removed all inside gasoline from gas components, will give you problems on next year use do to varnish builds up. From valve stick to stucked jets. Just a matter of having your carb stripped down and cleaned with acrylic thinner, carb cleaner, etc. Would be nearly impossible for manufacturers to place good quality filter cartridges, water separators inside engine because of insufficient space available, and probably much costier that standars screen filters.