You seem to be underinformed
Nope.
I don't really know what you mean by "no cryptocurrency that has the same features as Bitcoin", but Litecoin, a Bitcoin copycat by and large, already has SegWit and Lightning Network activated (there are even a few startups involved with that).
Decentralized, trustless, peer-to-peer currency (although more adjectives can be appended). You can easily create a semi-centralized or centralized altcoin that has a high TPS limit.
Therefore, we can't possibly have the same problems with it. In fact, it would be particularly interesting to see how these features would show themselves under heavy load (especially Lightning Network)
Of course you can. SegWit with LN in combination with the block size limit of LTC are also capped at a fixed TPS. Even though,
you can argue that once payment channels have been established that they have *infinite* TPS.
If so, how can you then claim that it will have the same problems? As far as I understand it, payment channels are created to specifically address the issue you are talking about (i.e. running out of processing capacity). Therefore, it is not about me arguing that payment channels can have infinite processing capacity. This is basically what they are there for in the first place. In this way, your whole claim is not valid (that no cryptocurrency like Bitcoin has found a solution)