There may some economic benefit to to doing some commercial time-building in a twin.

If you find yourself a 2000 ASEL CFI and are faced with buying 100 ME hours, yeah in restrospect maybe you should have done 100 hours of twin towards your COM. Since each time building hour is going to cost you about $70 / hour for the ASEL anyway, doing it in a twin gets you twin time for an additional $60-70/hour. You're trading some ASEL total-time to do that but you can always CFI for ASEL later.

Also it's common for GA twin jobs to require 50-100 ME hours for insurance reasons...having that in your pocket out of the gate means more opportunities to get paid to build even more twin time. 200-350 hours ME is often competitive when hiring is somewhat slow, and getting that first 50-100 is hardest.