Institutional investors can bring stability and liquidity to the Bitcoin ecosystem. They can also help to legitimize Bitcoin and make it more mainstream.what you think about this as a crypto guy ? 
This is very correct. It is only partially correct. Remember when Tesla sold 75% of its bitcoins and the market reacted downwards. The market is not that mature yet. If tomorrow a couple of major companies like Apple and Amazon announce that they are buying bitcoin and will accept them for payment, the price doubles in a week. And vice versa. If Saylor for example says it changes its mind and starts selling bitcoins we will be at levels below $20,000 in a few days.
The more the institutional cashflow Bitcoin enjoys, the less the chances of price fluctuations and market manipulation.