LN is a good option. But layer 2 have little or no support from wallet and services that already support Bitcoin.
You didn't look very hard. There are multiple ways to get an LN wallet. Of course you will have to use a custodial wallet unless you run your own node.
1. Do you have any data that prove "35% of the wallets are still re-using addresses"?
I assimilated the stat a couple of years ago. I don't remember the source. But Chivo wallet here in El Salvador re-uses addresses. Also many exchanges and businesses re-use addresses.
And Eligious mining pool re-use addresses for payouts I think.
Every time you see someone posting a QR code in a video or on a website, it's likely an address re-use unless they are using silent payments. And let's be clear here, nobody does use silent payments.
Than you got Coinbase wallet and pretty much all the wallets that support multiple other shitcoins. I know I have used 2 wallets in the last 3 years that re-used addresses. But I can't recal them right now. Cake maybe?
2. How can you be sure "They are obviously not concerned with privacy"? How about possibility they don't know how advance or accessible is blockchain analysis service?
You are making a mountain out of an ant hill. We are talking about under $12 of sats here. I promis you, chainalisys is not tracking your $12 transactions.
In the end, if we are to scale, we can't accommodate every dickbutt.jpeg, every coffee, every BigMac you want to buy. You would do well to compare on chain with bank wire transfers. Yes, wire transfers are still around $50 each, and they take 1-4 days.
But you don't have to re-use addresses. You can do a multisig for smaller sends, you can add more inputs to increase your change address balance. You can donate smaller amounts to miners, as many wallets already do. You can go on LN of Fedimint, or Liquid, or whatever new LN they might come up with.
When you want to send a bank wire, it will likely cost you $50. The banks are not trying to ban you from buying your coffee with a $50 fee. No, there are other payment methods your bank offers.
Same with bitcoin.
A large part of the world popation would have a problem with my suggested dust limit of $12.00. But do you know what other hurdles are present for those people? Cell phone, or laptop, and a reliable internet connection.
These days you can easily find Android phone below $100. Mobile internet cost per GB is also cheap
Look. We are going to have to compromise if we want bitcoin to scale. There are 8 billion people in the world. And bitcoin can only do around 7 txs/second. Do that math. That is one transaction per person every 36 years. And you still desperately want to hang on to the ability to send and receive $12 on chain?
A world wide adoption doesn't allow $12 transactions for everyone every day on chain.
Think about it. 16,800 sats is the price of a BigMac. Wiith 605,000 transactions per day on chain, if each person does just 1 transaction per day, we can't serve anything bigger than a large 2 million population city like Lima, Peru, or Brussels, Belgium, or Havana, Cuba, or Zaragoza, Spain.
And that is with only one transaction per day per person.
Do you understand the scale or the problem here? Do you understand that fighting spam is a scaling problem? Do you understand we can't be buying every BigMac on chain, if we want bitcoin to reach it's goal of world wide adoption?