Loose-leaf logbook systems are becoming increasingly popular. It is no
easier to falsify entries in these systems than in any other log.

Yes, pages can be removed, but then again maintenance can be performed and
not logged at all.

There is no particular form that logs have to take. They could in fact be
entirely electronic and probably will be in the future.

The "original logbooks" that come with the airplane are small and quickly
fill up. Their bindings get broken from having all kinds of tags and
additional papers stapled in there. Most logbooks end up being held together
with rubber bands. It is probably easier to lose pages from a bound logbook
than from a looseleaf.