According to BIP44 each HD wallet have a finite number of 2^32 addresses, Why is that the case?

[Bitcoin]

According to BIP44 each HD wallet have a finite number of 2^32 addresses, Why is that the case?

According to BIP32 we can have a seed from which we derive all our private and public keys, so in theory we can have an "infinite" number of child and grandchild keys so why does BIP44 limit that idea of infinity and limits HD wallets to only derive keys from the address_index the "fifth generation"

m / purpose' / coin_type' / account' / change / address_index

So in practice Bitcoin wallets following BIP44 can only generate 2³¹ keys, furthermore only 2³¹ possible Bitcoin addresses. Why is that the case when we can have an infinite amount of addresses?

Source: According to BIP44 each HD wallet have a finite number of 2^32 addresses, Why is that the case?