Raavya (12th-13th centuries) writes that as it is no longer the case that folks recline on couches when eating (as was common during the Greco-Roman period) one should eat upright at the table.
Hagaos Maimoniyos argues.
Folks nowadays all "lean".
Raavya's argument seems to be quite compelling.
The takanah ostensibly is to comport oneself in a regal manner (דרך חירות). It affects everything from how the table is set to the dilution of the wine.
At the time of the Talmud it was also expressed via הסיבה.
I don't believe it was formulated as a takanah to lean (and even if it was we'd presumably follow the reasoning and adjust accordingly).
Should that cease to be the norm for דרך חירות then we should follow whatever is considered aristocratic mealtime behavior which nowadays is eating seated upright at a table.
It's one thing to eat on a bed or couch as they did then (which I'd still argue negates the current iteration of דרך חירות) but to eat on a chair and lean onto something solid or worse an air lean seems to be neither here nor there.
How is leaning nowadays not a negation of דרך חירות (just like we don't dilute our wine anymore and if we did it would be a negation of דרך חירות)?