Any abilities that trigger when a creature card is "put into the graveyard from anywhere" would still trigger, because those abilities function from the graveyard, where the card is a new object that still has the ability
This changes their form and appearance and causes them to grow stronger
Now, if you really want to give your valuable or rare cards the best protection possible, toploaders are your best bet
Could also be useful with things that like to target, like Horobi, Deaths WailHorobi, Deaths Wail, Nadu, Winged WisdomNadu, Winged Wisdom, or cards that care about committing a crime
Level 4 is the most common level for a non-tuner monster in the game, so having these level 4 tuners provides an incredibly easy way to synchro summon for level 8