Not sure on expanding the draft to 10 rounds - the last 4 round or more of these drafts is loaded with poor work ethic 1 star or less guys. I did some quick research on draft history since 2017 (expansion year, and I do not count the 2020 draft since it was manually created) almost no players from round 5 and beyond have made it and, of those, almost none have done anything significant.
I know I have picked up one FA (post draft) who has turned into a very good player (David Pegas), but I have been pretty active (and perhaps I have a bad eye for FA talent), but very few ever really improved. They just became farm system fodder and eventually released into the FA pile a few seasons after I signed them.
2017
10 players round 4 and on made it to AFBL - none has a VORP over 3.6 and he played only 130 games.
2018
12 players round 4+. One 36.4 VORP, a relief pitcher and one guy at 11.7, the other 10 were insignificant.
2019
15 hitters and no pitchers from round 4+. Two 4th round solid players, 40.3 VORP and 25.4.
2021
9 total players round 4+. No one of significance.
2022
14 players, only 1 has played in 100 games.
2023+
I realize this will change but only 12 players from 2023 and on have sniffed the AFBL.
Overall
I think only 1 player before round 5 has made a real impact, and it is as a reliever. The numbers do not really justify adding more rounds to the draft. I don't care one way or the other, but I am not worried that the extra 'talent' is going to really help the more active owners...