firstly. what you are sending through routes is not BTC. its an invoice measured in millisats. a unit of measure the bitcoin network does not understand and in a packet of data the bitcoin network would not accept.
these invoices and htlc secret reveals are not bitcoin network compatible.they are their own format.

the latter in channel contract update (after htlc secret reveal) are not between the sender and receiver of a route. but a contract update between the partners inside their channel and only done on the success of the hops of channels success.

its nothing like bitcoin.
heck the whole last 5 years has been alot of dev drama of trying to change bitcoin to become LN compatible.
the silly thing is LN does not have a consensus mechanism nor a blockchain all nodes need to follow, so it should be LN that should change if it wants to replicate bitcoins format. not the other way round.

maybe if you were more honest to say whats different about LN then you could actually turn it into good PR as to why people should use it as oppose to bitcoin. but trying to promote it as bitcoin and part of bitcoin as if its the same thing, is both misleading on its features and niche. but also its putting people at an extreme risk of not understanding the different security risk, problems with payments and why bitcoin is better.

i know you dont like bitcoin anymore and you dont want bitcoin to expand and grow and anyone that does you simply want to tell them to go away to another coin.. thats been your personal game plan for years, offramping users to other networks.

but here is the thing, i am not the only person that likes bitcoin. i am not the only one that wants bitcoin to grow and have more utility. without the need for constant promoting of other networks being the solution people should move over to.

i doubt that you can even admit that LN is a separate network that measures value in a different denomination than the bitcoin network. but that should be your first realisation to why LN is different and not bitcoin