Bech32-type addresses are more efficient, yes.
But you don't have any problems with sending/receiving to/from any address.
You can send/receive to/from any address you wish. Everything will work as before.
The problem with the slow adoption is that some wallets/exchanges/service provider won't allow you to enter a BTC address starting with bc1..
simply because they have a check-function to make sure you enter a "valid" btc address.
And as soon they check your address is neither starting with 1.. nor with 3.. they will give you an "wrong format" error.
This is just a problem of the exchanges/wallets/...
This has nothing to do with bitcoin/segwit itself.
Ok, I got it. I thought that was strange as well, since segwit came out of a soft fork, so I actually expected that the "old addresses" would still be compatible with the segwit ones, but I then heard things about those compatibility issues, and I wasn't fully understanding them. So it's all software related, so we just need to wait for wallets to be updated. I heard that the new version of Bitcoin Core wallet due to complete by May 1, should help solving these "problems".