Yes indeed, if you start using your alternate fuel (not final reserve fuel) to either hold at your destination or divert, you are commited to land.
Often your destination is the best choice as long as weather is well above minima.
Better to use
some of your alternate fuel to go to your two parallel rwy destination than to use
all of your alternate fuel to go to your single rwy alternate?
Some extra fuel makes it a little more relaxed. Ask the 'older' guys, they tell me aviation is about three things: fuel, fuel and fuel!
I suspect they all have been in that corner and they know how it feels to run out of options (which was not very hard to avoid).
Cheers