I like the fractional share feature although I think it is mainly a gimmick. It just means I can sell off a stock position in which I have been reinvesting dividends (hence have a fractional share amount) immediately instead of waiting an extra couple of days for Fidelity to liquidate the fractional part.
I wonder if this is hurting Berkshire Class B shares. I would rather own Class A and fractional share trading makes that as easy as owning Class B. (Actually BRK is a stock I would not touch, but hypothetically speaking...)
Fractional shares now are in preparation for eventually offering ETFs within 401k/403b/457. For auto-investing through payroll deductions every month, fractional share capability is an essential first step.
FWIW, fractional shares were good for my granddaughter's UTMA account as her small account could accumulate some GOOGL.
It may have been a gimmick when it was started, but Fidelity and Schwab have joined with greater purposes in mind.
I have been buying shares at Fidelity by dollar amounts and hence get fractional shares. Prefer it to the alternative because it is easy to judge current performance. I use the 'sell all shares' option when selling, or the fractional share remains unsold, until you sell it. I haven't tried to buy a fraction of one share, though.
haven, in my granddaughter's UTMA, we bought 1/2 share of GOOGL twice in March 2020. So, yes, you can just buy fractional shares. They almost doubled and were sold recently and proceeds deployed into some mutual funds.