No, that's wrong. Everyone wants or will want it, since it allows them to send BTC faster and cheaper. It certainly took many years to get to a well-working state; remember how just few years ago, everyone who was actually using it on mainnet was in the 'reckless club' and expecting to lose some funds sooner or later
It's technologically quite tricky and the protocol and implementation had to be thoroughly thought through and tested before the large audience could be tackled. It hasn't been until very recently that LN was really marketed towards the average Joe, so I am sure adoption will rise exponentially.

Merchants and services do usually offer Lightning; it's made very easy through software like https://btcpayserver.org/.
Exchanges not yet; I suspect to collect more fees. Especially when we see exchanges charging 25 bucks to withdraw BTC, while a 1sat/vB tx costs 0.08€ to send, it becomes clear they are making big gains on those withdrawals. They also don't actually want people to withdraw, so they trade (and lose) more money to the exchange. LN makes it easy and cheap to withdraw; both of which are quite bad for exchanges and also i.e. gambling sites.