Why the aversion to cash deals? Would you do one if you could?

[JJ Conway]

At most REIAs I've attended, many experienced investors try to dissuade new investors from doing cash deals.I understand the mathematical concepts around leverage, and I get that most of the time newcomers can't jump into real estate investing with all-cash deals. I also understand that, in many cases, the advanced investor makes money from mentoring, providing HMLs, etc. I just think you get better ROI (and much less pressure/stress) doing cash deals (if you can afford it).

So tell me, from your perspective: if you could do cash deals (meaning paid for property and repairs in full-no loans), would you?Why or why not?