re: Is it now acceptable to quit the same day you give notice?

I recently had a similar situation. Work for a local engineering firm and recently had the opportunity to move to a big national firm. Pay was much bigger and bonuses structure was great and insane retirement plan. Hated I was going to have to leave as I love my boss and I’m the only young person at the company and it was really going to hurt them but it was money I couldn’t turn down. Went in to give them a months notice but was prepared to give more if I needed it. Like I said I’m in engineering so it would have taken me all of that long to get projects either wrapped up or handed off in a way for a smooth transition and I wanted to keep my clients happy obviously. Explained my boss the situation and he just said “Ill match it”. Gave him the offer. Next day I came in and they matched the salary and exceeded the bonus structure. They said we don’t know how they are able to do that with the retirement package so we are just going to give you ownership of 5 percent of the company. Told them that was all I needed to hear and I signed the ownership papers shortly after. Worked out well.