Both my husband and his older brother were big Lego fans when they were growing up. Their parents faithfully kept boxes of freestyle Lego in their basement for almost 40 years, but finally they saw the light of the day again. Last time my in-laws visited, one of their suitcases contained nothing but Legos, and it was only half of their collection.
Legos of today are more "specialized". One can build an excavator using instructions on the box, but it's not possible to build a rocket out of the same set. My husband's Lego has a lot of wheels and some specialized parts (for example, connector for the truck's cabin and the rest of the truck), but the rest of it is thousands and thousands small parts. Luckily, Anna is not a mouther, and so my husband opened her treasures to her. He has so much fun building things "with her" (mostly for her at this point), and she is very proud about her growing collection of toys made exclusively out of Lego. The good news is that they can always be rebuilt into something completely different, and that hopefully she will be able to build simpler things herself one day. Here is her collection at a glance: