My goal for 2020 was to get an investment property (SFR, duplex, triplex).Question: What would be the advantage of refinancing with the bank if the seller actually agreed to finance?

If one day and $500 in airfare skew a deal then it wasn't a dealThe big advantage Texas has over most states is the ability to evict a tenant in +-21 days where as many states can take months. 

Some title companies are taking advantage of technology & doing online closings using Zoom. 

And lots of small landlords put their worst foot forward further alienate the 80-90% of tenants who are fine out of a (justifiable) fear of the 10% who take advantage.

Best advice at the moment is to take advantage of the next four months to read and learn everything you can about your prefered investment method.  

I can see the advantage to finding distressed multis and fixing them up yourself.

Being my first home and not knowing much about investment one thing i did learn was to be more aware of how the condition of the units were and using that to my advantage to negotiate for a low price range

This is somewhat similar to a fast for restaurant; if Mcdonalds didn't enforce minimum standards of cleanliness and operations, a few badly run franchises would end up lowering sales volume across the chain.The issue seems to be when STR operators feel that AirBnB has unjustly taken the side of the renter when the operator has perceived that he has done everything correctly and the renter is just taking advantage of a situation, such as he really wants to cancel a reservation past the cancellation period and so uses an excuse to get a refund.  

Anyways, I'm wondering what peoples thoughts are on the best way to take advantage of market conditions during these tumultuous times, from scratch.

I think your funds could be better utilized on picking up lists of properties that are about to turn, and acquiring some of the apps that are most advantageous to vacant/distressed homes.