What exactly would "properly" arming Ukraine look like? The entire Western world doesn't produce enough Patriot missiles to meet Ukraine's air defense needs, just as one critical example. We are aiming for a global production target of 750 missiles/year (
https://www.asahi.com/ajw/articles/15354795 ).... Russia has fired about 6,000 missiles and large drones per year (
https://kyivindependent.com/defense-ministry-over-2-000-russ... ).
You can send Ukraine all of the F-16s in the world, it won't matter if there aren't enough Ukrainian pilots with the linguistic skills to get them through the Western training pipelines.
The reality is that the West can't make the math work at a level of commitment/investment that it is willing to accept. To say nothing of the steadily-worsening problem of "lack of living, breathing Ukrainian men willing to do the fighting in the first place"...