What The Old Soul said, basicly.
This is how 5E works. Dont like it, bring it up with wotc. Or try to mod it I guess.
The whole respeccing at will is a blight in my eyes and goes completly counter to the whole dnd experience that you get at a tabletop. I know its a video game and specially casuals 'need' it. But it cheapens the experience of only gaining levels as you level up and not suddenly respec once you got a few under your belt for some powergaming builds. It also prevents people from actually learning from their mistakes as they can just willy nilly make entire new builds without learning how their old build works FIRST. Which as it stands actually means you learn more in the long run if you do go that route.
That said, make a mistake during character creation and youre kinda boned. So for more casual people I want to stress I really understand the inclusion. I just dont use it myself and have no problem with it that way.